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Retirement Benefits - Additional Information (Detail) ₨ in Thousands, $ in Millions | 12 Months Ended
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Mar. 31, 2022 INR (₨) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 INR (₨) | Mar. 31, 2020 INR (₨)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, expected contribution to the plan for the next fiscal year | ₨ 1,804,600 |  |  |
Defined benefit plan, accumulated benefit obligation | 6,914,800 |  | ₨ 5,455,600 |
Defined contribution plan, employer contribution recognized as an expense | ₨ 6,844,700 |  | 5,429,600 | ₨ 4,901,400
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 | ₨ 1,795,300 |  | 1,513,700 | ₨ 1,269,900
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 |  |  |
National Pension Scheme [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined contribution plan, employer contribution recognized as an expense | ₨ 57,200 |  | 46,300 |
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 | ₨ 1,633,000 | $ 21.5 | 1,384,800 |
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 | ₨ 6,397,400 |  | 4,727,700 |
Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, expected contribution to the plan for the next fiscal year | 188,600 |  |  |
Defined benefit plan, accumulated benefit obligation | 354,600 |  | 364,200 |
Employer contributions | ₨ 207,000 | $ 2.7 | 23,000 |
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 | ₨ 353,800 |  | ₨ 362,900 |

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