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Net Pension Cost (Detail) - Pension
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Mar. 31, 2017
INR (₨)
Defined Benefit Plan Disclosure [Line Items]        
Service cost ₨ 7.7 $ 0.1 ₨ 7.6 ₨ 12.9
Interest cost 66.3 1.0 57.9 53.4
Expected return on plan assets (18.6) (0.3) (23.6) (26.1)
Actuarial (gains)/losses 1.7 0.0 16.7 17.7
Net pension cost [1] ₨ 57.1 $ 0.8 ₨ 58.6 ₨ 57.9
[1] Effective April 1, 2018, the Bank adopted ASU 2017-07 Compensation- Retirement Benefits (Topic 715) -Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. Accordingly, service cost is reported in the Consolidated Statements of Income in line Non-interest expense-salaries and staff benefits and other components of net benefit cost is reported in the Consolidated Statements of Income in line Non-interest expense -Administrative and other. The amendments have been applied retrospectively.