Retirement benefits - Funded Status of Pension Plan and Amounts Recognized in Bank's Financial Statements (Detail) - Pension ₨ in Millions, $ in Millions |
12 Months Ended | ||||||
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Mar. 31, 2026
INR (₨)
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Mar. 31, 2026
USD ($)
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Mar. 31, 2025
INR (₨)
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Mar. 31, 2024
INR (₨)
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Mar. 31, 2026
USD ($)
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| Change in benefit obligations: | |||||||
| Projected benefit obligation ("PBO"), beginning of the period | ₨ 1,250.3 | $ 13.3 | ₨ 987.3 | ||||
| Past service cost | [1] | 31.2 | 0.3 | 0.0 | |||
| Service cost | 86.6 | 0.9 | 28.4 | ||||
| Interest cost | 86.6 | 0.9 | 71.6 | ₨ 76.4 | |||
| Actuarial (gains)/losses | (70.2) | (0.7) | 274.7 | ||||
| Benefits paid | (87.8) | (0.9) | (111.7) | ||||
| Projected benefit obligation, end of the period | 1,210.1 | 12.9 | 1,250.3 | 987.3 | |||
| Change in plan assets: | |||||||
| Fair value of plan assets, beginning of the period | 161.5 | 1.7 | 161.5 | ||||
| Expected return on plan assets | 12.7 | 0.1 | 10.5 | 6.5 | |||
| Actuarial gains/(losses) | (3.7) | 0.0 | 1.3 | ||||
| Actual return on plan assets | 9.0 | 0.1 | 11.8 | ||||
| Employer contributions | 145.3 | 1.5 | 99.9 | ||||
| Benefits paid | (87.8) | (0.9) | (111.7) | ||||
| Fair value of plan assets, end of the period | 228.0 | $ 2.4 | 161.5 | ₨ 161.5 | |||
| Funded Status | ₨ (982.1) | ₨ (1,088.8) | $ (10.5) | ||||
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- Definition The net increase or decrease of changes in the value of the benefit obligation resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan. No definition available.
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| X | ||||||||||
- Definition Defined benefit plan prior service cost credit. No definition available.
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| X | ||||||||||
- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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| X | ||||||||||
- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of cost recognized for passage of time related to defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Details
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