| r0.1 | label_boi_a2/Previous Period | | | | boi_BC:x1 | N/A | N/A | N/A | N/A | boi_RP:x13 |
| r1.1 | Consolidated/Previous Period | | | | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_RP:x13 |
| 1.1 | Credit for rents and leasing to the end of reported year/Previous Period | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x929 | N/A | N/A | boi_RP:x13 |
| 2.1 | Buildings and equipment for sale/Previous Period | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x6 | N/A | boi_PL:x43 | boi_RP:x13 |
| 3.1 | Credit that has not yet noted to the end of the reported year/Previous Period | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x930 | N/A | N/A | boi_RP:x13 |
| 4.1 | Buildings and equipment unused by corporation/Previous Period | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x6 | N/A | boi_PL:x44 | boi_RP:x13 |
| 5.1 | Buildings and equipment unused by corporation - real estate for investment/Previous Period | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x6 | N/A | boi_PL:x44 | boi_RP:x13 |
| 6.1 | Buildings and equipment unused by corporation - Impairment loss/Previous Period | boi_met:md348 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x6 | boi_MU:x1 | boi_PL:x44 | boi_RP:x13 |
| 7.1 | Buildings and equipment unused by corporation - Reversing impairment loss/Previous Period | boi_met:md349 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x6 | boi_MU:x1 | boi_PL:x44 | boi_RP:x13 |
| 8.1 | Buildings and equipment for sale - Impairment loss/Previous Period | boi_met:md348 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x6 | boi_MU:x1 | boi_PL:x43 | boi_RP:x13 |
| 9.1 | Buildings and equipment for sale - Reversing impairment loss/Previous Period | boi_met:md349 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | boi_MC:x6 | boi_MU:x1 | boi_PL:x43 | boi_RP:x13 |
| 10.1 | Recognized exists on fixed assets under construction/Previous Period | boi_met:mi354 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_RP:x13 |
| 11.1 | Contractual engagements on fixed assets/Previous Period | boi_met:mi355 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_RP:x13 |
| 12.1 | Compensation from third parties in respect to fixed assets/Previous Period | boi_met:mi356 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x2 | N/A | N/A | N/A | boi_RP:x13 |
| r14.1 | Solo/Previous Period | | | | boi_BC:x1 | boi_CS:x3 | N/A | N/A | N/A | boi_RP:x13 |
| 13.1 | Credit for rents and leasing to the end of reported year/Previous Period | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x3 | boi_MC:x929 | N/A | N/A | boi_RP:x13 |
| 14.1 | Buildings and equipment for sale/Previous Period | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x3 | boi_MC:x6 | N/A | boi_PL:x43 | boi_RP:x13 |
| 15.1 | Credit that has not yet noted to the end of the reported year/Previous Period | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x3 | boi_MC:x930 | N/A | N/A | boi_RP:x13 |
| 16.1 | Buildings and equipment unused by corporation/Previous Period | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x3 | boi_MC:x6 | N/A | boi_PL:x44 | boi_RP:x13 |
| 17.1 | Buildings and equipment unused by corporation - real estate for investment/Previous Period | boi_met:mi1 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x3 | boi_MC:x6 | N/A | boi_PL:x44 | boi_RP:x13 |
| 18.1 | Buildings and equipment unused by corporation - Impairment loss/Previous Period | boi_met:md348 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x3 | boi_MC:x6 | boi_MU:x1 | boi_PL:x44 | boi_RP:x13 |
| 19.1 | Buildings and equipment unused by corporation - Reversing impairment loss/Previous Period | boi_met:md349 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x3 | boi_MC:x6 | boi_MU:x1 | boi_PL:x44 | boi_RP:x13 |
| 20.1 | Buildings and equipment for sale - Impairment loss/Previous Period | boi_met:md348 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x3 | boi_MC:x6 | boi_MU:x1 | boi_PL:x43 | boi_RP:x13 |
| 21.1 | Buildings and equipment for sale - Reversing impairment loss/Previous Period | boi_met:md349 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x3 | boi_MC:x6 | boi_MU:x1 | boi_PL:x43 | boi_RP:x13 |
| 22.1 | Recognized exists on fixed assets under construction/Previous Period | boi_met:mi354 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x3 | N/A | N/A | N/A | boi_RP:x13 |
| 23.1 | Contractual engagements on fixed assets/Previous Period | boi_met:mi355 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x3 | N/A | N/A | N/A | boi_RP:x13 |
| 24.1 | Compensation from third parties in respect to fixed assets/Previous Period | boi_met:mi356 | xbrli:monetaryItemType | instant | boi_BC:x1 | boi_CS:x3 | N/A | N/A | N/A | boi_RP:x13 |