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Net Gratuity Cost (Detail) - Gratuity ₨ in Millions, $ in Millions | 12 Months Ended
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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.

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