| Income tax relating to remeasurements of defined benefit plans of other comprehensive income | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Income tax relating to remeasurements of defined benefit plans of other comprehensive income | en | http://www.xbrl.org/2009/role/negatedLabel | http://www.xbrl.org/2003/role/link |
| The amount of income tax relating to amounts recognised in other comprehensive income in relation to remeasurements of defined benefit plans. [Refer: Other comprehensive income; Reserve of remeasurements of defined benefit plans; Defined benefit plans [member]] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |