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Net Gratuity Cost (Detail) - Gratuity
₨ 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 ₨ 820.6 $ 11.9 ₨ 741.0 ₨ 860.6
Interest cost 476.7 6.9 392.2 454.6
Expected return on plan assets (347.4) (5.0) (297.4) (389.7)
Actuarial (gains)/losses (176.6) (2.6) 85.1 287.6
Net gratuity cost [1] ₨ 773.3 $ 11.2 ₨ 920.9 ₨ 1,213.1
[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.