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Net Pension Cost (Detail) - Pension
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
Mar. 31, 2018
INR (₨)
Defined Benefit Plan Disclosure [Line Items]        
Service cost ₨ 6.5 $ 0.1 ₨ 7.7 ₨ 7.6
Interest cost 45.3 0.6 66.3 57.9
Expected return on plan assets (11.0) (0.1) (18.6) (23.6)
Actuarial (gains)/losses 12.4 0.2 1.7 16.7
Net pension cost [1] ₨ 53.2 $ 0.8 ₨ 57.1 ₨ 58.6
[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.