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Net Gratuity Cost (Detail) - Gratuity
₨ 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 ₨ 965.4 $ 12.8 ₨ 820.6 ₨ 741.0
Interest cost 483.3 6.4 476.7 392.2
Expected return on plan assets (389.9) (5.2) (347.4) (297.4)
Actuarial (gains)/losses 989.4 13.1 (176.6) 85.1
Net gratuity cost [1] ₨ 2,048.2 $ 27.1 ₨ 773.3 ₨ 920.9
[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.