| r0.1 | label_boi_a2/Salaries | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x609 | boi_MU:x1 | boi_RP:x24 | N/A | N/A |
| r0.2 | label_boi_a2/Share based payments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x610 | boi_MU:x1 | boi_RP:x24 | N/A | N/A |
| r0.3 | label_boi_a2/Compensation, pension, Training fund | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x611 | boi_MU:x1 | boi_RP:x24 | N/A | N/A |
| r0.4 | label_boi_a2/Additions to reserves for related expenses due to changes in wages | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x612 | boi_MU:x1 | boi_RP:x24 | N/A | N/A |
| r0.5 | label_boi_a2/Total salaries and related expenses excluding payroll tax | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x608 | boi_MU:x1 | boi_RP:x24 | N/A | N/A |
| r0.6 | label_boi_a2/Other payments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x613 | boi_MU:x1 | boi_RP:x24 | N/A | N/A |
| r0.7 | label_boi_a2/Balance | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | N/A | boi_RP:x24 | boi_ST:x38 | N/A |
| r0.8 | label_boi_a2/Average term to maturity (years) | boi_met:rd101 | xbrli:decimalItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | boi_MU:x1 | boi_RP:x24 | boi_ST:x38 | N/A |
| r0.9 | label_boi_a2/Benefits granted during the year | boi_met:md306 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | boi_MU:x1 | boi_RP:x24 | boi_ST:x38 | N/A |
| r0.10 | label_boi_a2/Loans granted under regular conditions | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | N/A | boi_RP:x24 | boi_ST:x39 | N/A |
| r0.11 | label_boi_a2/Other benefits | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x614 | boi_MU:x1 | boi_RP:x24 | N/A | N/A |
| r0.12 | label_boi_a2/Payments by controlling shareholder or companies controlled by him | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x615 | boi_MU:x1 | boi_RP:x24 | N/A | N/A |
| 1.1 | The highest wage earner/Salaries | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x609 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x109 |
| 1.2 | The highest wage earner/Share based payments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x610 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x109 |
| 1.3 | The highest wage earner/Compensation, pension, Training fund | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x611 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x109 |
| 1.4 | The highest wage earner/Additions to reserves for related expenses due to changes in wages | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x612 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x109 |
| 1.5 | The highest wage earner/Total salaries and related expenses excluding payroll tax | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x608 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x109 |
| 1.6 | The highest wage earner/Other payments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x613 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x109 |
| 1.7 | The highest wage earner/Balance | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | N/A | boi_RP:x24 | boi_ST:x38 | boi_VI:x109 |
| 1.8 | The highest wage earner/Average term to maturity (years) | boi_met:rd101 | xbrli:decimalItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | boi_MU:x1 | boi_RP:x24 | boi_ST:x38 | boi_VI:x109 |
| 1.9 | The highest wage earner/Benefits granted during the year | boi_met:md306 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | boi_MU:x1 | boi_RP:x24 | boi_ST:x38 | boi_VI:x109 |
| 1.10 | The highest wage earner/Loans granted under regular conditions | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | N/A | boi_RP:x24 | boi_ST:x39 | boi_VI:x109 |
| 1.11 | The highest wage earner/Other benefits | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x614 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x109 |
| 1.12 | The highest wage earner/Payments by controlling shareholder or companies controlled by him | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x615 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x109 |
| 2.1 | Secound-highest wage earner/Salaries | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x609 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x110 |
| 2.2 | Secound-highest wage earner/Share based payments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x610 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x110 |
| 2.3 | Secound-highest wage earner/Compensation, pension, Training fund | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x611 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x110 |
| 2.4 | Secound-highest wage earner/Additions to reserves for related expenses due to changes in wages | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x612 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x110 |
| 2.5 | Secound-highest wage earner/Total salaries and related expenses excluding payroll tax | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x608 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x110 |
| 2.6 | Secound-highest wage earner/Other payments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x613 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x110 |
| 2.7 | Secound-highest wage earner/Balance | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | N/A | boi_RP:x24 | boi_ST:x38 | boi_VI:x110 |
| 2.8 | Secound-highest wage earner/Average term to maturity (years) | boi_met:rd101 | xbrli:decimalItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | boi_MU:x1 | boi_RP:x24 | boi_ST:x38 | boi_VI:x110 |
| 2.9 | Secound-highest wage earner/Benefits granted during the year | boi_met:md306 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | boi_MU:x1 | boi_RP:x24 | boi_ST:x38 | boi_VI:x110 |
| 2.10 | Secound-highest wage earner/Loans granted under regular conditions | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | N/A | boi_RP:x24 | boi_ST:x39 | boi_VI:x110 |
| 2.11 | Secound-highest wage earner/Other benefits | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x614 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x110 |
| 2.12 | Secound-highest wage earner/Payments by controlling shareholder or companies controlled by him | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x615 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x110 |
| 3.1 | Third-highest wage earner/Salaries | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x609 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x111 |
| 3.2 | Third-highest wage earner/Share based payments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x610 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x111 |
| 3.3 | Third-highest wage earner/Compensation, pension, Training fund | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x611 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x111 |
| 3.4 | Third-highest wage earner/Additions to reserves for related expenses due to changes in wages | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x612 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x111 |
| 3.5 | Third-highest wage earner/Total salaries and related expenses excluding payroll tax | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x608 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x111 |
| 3.6 | Third-highest wage earner/Other payments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x613 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x111 |
| 3.7 | Third-highest wage earner/Balance | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | N/A | boi_RP:x24 | boi_ST:x38 | boi_VI:x111 |
| 3.8 | Third-highest wage earner/Average term to maturity (years) | boi_met:rd101 | xbrli:decimalItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | boi_MU:x1 | boi_RP:x24 | boi_ST:x38 | boi_VI:x111 |
| 3.9 | Third-highest wage earner/Benefits granted during the year | boi_met:md306 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | boi_MU:x1 | boi_RP:x24 | boi_ST:x38 | boi_VI:x111 |
| 3.10 | Third-highest wage earner/Loans granted under regular conditions | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | N/A | boi_RP:x24 | boi_ST:x39 | boi_VI:x111 |
| 3.11 | Third-highest wage earner/Other benefits | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x614 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x111 |
| 3.12 | Third-highest wage earner/Payments by controlling shareholder or companies controlled by him | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x615 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x111 |
| 4.1 | Fourth-highest wage earner/Salaries | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x609 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x112 |
| 4.2 | Fourth-highest wage earner/Share based payments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x610 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x112 |
| 4.3 | Fourth-highest wage earner/Compensation, pension, Training fund | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x611 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x112 |
| 4.4 | Fourth-highest wage earner/Additions to reserves for related expenses due to changes in wages | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x612 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x112 |
| 4.5 | Fourth-highest wage earner/Total salaries and related expenses excluding payroll tax | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x608 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x112 |
| 4.6 | Fourth-highest wage earner/Other payments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x613 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x112 |
| 4.7 | Fourth-highest wage earner/Balance | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | N/A | boi_RP:x24 | boi_ST:x38 | boi_VI:x112 |
| 4.8 | Fourth-highest wage earner/Average term to maturity (years) | boi_met:rd101 | xbrli:decimalItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | boi_MU:x1 | boi_RP:x24 | boi_ST:x38 | boi_VI:x112 |
| 4.9 | Fourth-highest wage earner/Benefits granted during the year | boi_met:md306 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | boi_MU:x1 | boi_RP:x24 | boi_ST:x38 | boi_VI:x112 |
| 4.10 | Fourth-highest wage earner/Loans granted under regular conditions | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | N/A | boi_RP:x24 | boi_ST:x39 | boi_VI:x112 |
| 4.11 | Fourth-highest wage earner/Other benefits | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x614 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x112 |
| 4.12 | Fourth-highest wage earner/Payments by controlling shareholder or companies controlled by him | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x615 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x112 |
| 5.1 | Fifth-highest wage earner/Salaries | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x609 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x108 |
| 5.2 | Fifth-highest wage earner/Share based payments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x610 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x108 |
| 5.3 | Fifth-highest wage earner/Compensation, pension, Training fund | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x611 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x108 |
| 5.4 | Fifth-highest wage earner/Additions to reserves for related expenses due to changes in wages | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x612 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x108 |
| 5.5 | Fifth-highest wage earner/Total salaries and related expenses excluding payroll tax | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x608 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x108 |
| 5.6 | Fifth-highest wage earner/Other payments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x613 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x108 |
| 5.7 | Fifth-highest wage earner/Balance | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | N/A | boi_RP:x24 | boi_ST:x38 | boi_VI:x108 |
| 5.8 | Fifth-highest wage earner/Average term to maturity (years) | boi_met:rd101 | xbrli:decimalItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | boi_MU:x1 | boi_RP:x24 | boi_ST:x38 | boi_VI:x108 |
| 5.9 | Fifth-highest wage earner/Benefits granted during the year | boi_met:md306 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | boi_MU:x1 | boi_RP:x24 | boi_ST:x38 | boi_VI:x108 |
| 5.10 | Fifth-highest wage earner/Loans granted under regular conditions | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | N/A | boi_RP:x24 | boi_ST:x39 | boi_VI:x108 |
| 5.11 | Fifth-highest wage earner/Other benefits | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x614 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x108 |
| 5.12 | Fifth-highest wage earner/Payments by controlling shareholder or companies controlled by him | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x615 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x108 |
| 6.1 | Total wages of the five highest wage earners - consolidated/Salaries | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x609 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x113 |
| 6.2 | Total wages of the five highest wage earners - consolidated/Share based payments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x610 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x113 |
| 6.3 | Total wages of the five highest wage earners - consolidated/Compensation, pension, Training fund | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x611 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x113 |
| 6.4 | Total wages of the five highest wage earners - consolidated/Additions to reserves for related expenses due to changes in wages | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x612 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x113 |
| 6.5 | Total wages of the five highest wage earners - consolidated/Total salaries and related expenses excluding payroll tax | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x608 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x113 |
| 6.6 | Total wages of the five highest wage earners - consolidated/Other payments | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x613 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x113 |
| 6.7 | Total wages of the five highest wage earners - consolidated/Balance | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | N/A | boi_RP:x24 | boi_ST:x38 | boi_VI:x113 |
| 6.8 | Total wages of the five highest wage earners - consolidated/Average term to maturity (years) | boi_met:rd101 | xbrli:decimalItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | boi_MU:x1 | boi_RP:x24 | boi_ST:x38 | boi_VI:x113 |
| 6.9 | Total wages of the five highest wage earners - consolidated/Benefits granted during the year | boi_met:md306 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | boi_MU:x1 | boi_RP:x24 | boi_ST:x38 | boi_VI:x113 |
| 6.10 | Total wages of the five highest wage earners - consolidated/Loans granted under regular conditions | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x8 | N/A | boi_RP:x24 | boi_ST:x39 | boi_VI:x113 |
| 6.11 | Total wages of the five highest wage earners - consolidated/Other benefits | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x614 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x113 |
| 6.12 | Total wages of the five highest wage earners - consolidated/Payments by controlling shareholder or companies controlled by him | boi_met:md13 | xbrli:monetaryItemType | instant | boi_BC:x10 | boi_CS:x2 | boi_MC:x615 | boi_MU:x1 | boi_RP:x24 | N/A | boi_VI:x113 |