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Retirement Benefits - Additional Information (Detail) $ 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] |  |  |  |
Defined benefit plan, expected contribution to the plan for the next fiscal year | ₨ 1,960,600,000 |  |  |
Defined benefit plan, accumulated benefit obligation | 5,005,900,000 |  | ₨ 3,777,300,000 |
Defined contribution plan, employer contribution recognized as an expense | ₨ 4,901,400,000 |  | 3,312,100,000 | ₨ 3,081,400,000
Superannuation |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined contribution plan, employer annual contribution as a percentage of eligible annual salary | 13.00% | 13.00% |  |
Defined contribution plan, employer contribution recognized as an expense | ₨ 1,269,900,000 |  | 1,034,100,000 | ₨ 676,800,000
Superannuation | Managing Director, Executive Directors and for certain employees of CBoP |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined contribution plan, employer annual contribution as a percentage of eligible annual salary | 15.00% | 15.00% |  |
Provident Fund |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined contribution plan, employer annual contribution as a percentage of eligible annual salary | 12.00% | 12.00% |  |
Provident Fund Administered by Regional Provident Fund Commissioner |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined contribution plan - contribution to Pension Scheme administered by Regional Provident Fund Commissioner, percentage considered - lower of the percentage of employees eligible salary or fixed amount | 8.33% | 8.33% |  |
Provident Fund Administered by Regional Provident Fund Commissioner | Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contributions | ₨ 15,000.000 |  |  |
National Pension Scheme [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined contribution plan, employer contribution recognized as an expense | ₨ 37,900,000 |  | 32,700,000 |
Gratuity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, number of days of eligible salary payable for each completed year of service | 15 days | 15 days |  |
Defined benefit plan, vesting period | 15 years | 15 years |  |
Employer contributions | ₨ 1,096,700,000 | $ 14.5 | 1,023,700,000 |
Gratuity | Centurion Bank of Punjab Limited |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Lock-in-period after which contribution made for employees stand frozen and will be converted into an annuity on separation | 2 years | 2 years |  |
Gratuity | Vested accumulated benefit obligation |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, accumulated benefit obligation | ₨ 4,381,200,000 |  | 3,292,400,000 |
Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, expected contribution to the plan for the next fiscal year | 129,700,000 |  |  |
Defined benefit plan, accumulated benefit obligation | 387,000,000.0 |  | 468,300,000 |
Employer contributions | ₨ 8,300,000 | $ 0.1 | 8,800,000 |
Pension | Centurion Bank of Punjab Limited |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, employer contribution as a percentage of basic salary | 10.00% | 10.00% |  |
Pension | Centurion Bank of Punjab Limited | Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit pension plan, Service period of employees for whom contribution made stand frozen and will be converted into an annuity on separation | 10 years | 10 years |  |
Pension | Centurion Bank of Punjab Limited | Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit pension plan, Service period of employees for whom contribution made stand frozen and will be converted into an annuity on separation | 15 years | 15 years |  |
Pension | Vested accumulated benefit obligation |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, accumulated benefit obligation | ₨ 241,300,000 |  | ₨ 455,500,000 |

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