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Retirement Benefits - Additional Information (Detail) - INR (₨) | 12 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
Superannuation |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan, employer annual contribution as a percentage of eligible annual salary | 13.00% |  |
Defined contribution plan, employer contribution recognized as an expense | ₨ 565,400,000 | ₨ 536,800,000 | ₨ 432,200,000
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% |  |
Provident Fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan, employer annual contribution as a percentage of eligible annual salary | 12.00% |  |
Defined contribution plan, employer contribution recognized as an expense | ₨ 1,889,400,000 | 1,600,200,000 | ₨ 1,433,400,000
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% |  |
Provident Fund Administered by Regional Provident Fund Commissioner | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan -contribution to Pension Scheme administered by Regional Provident Fund Commissioner, amount considered - lower of the percentage of employees eligible salary or fixed amount | ₨ 15,000 |  |
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 |  |
Defined benefit plan, vesting period | 5 years |  |
Defined benefit plan, expected contribution to the plan for the next fiscal year | ₨ 479,500,000 |  |
Defined benefit plan, accumulated benefit obligation | 2,137,200,000 | 1,680,600,000 |
Gratuity | Vested accumulated benefit obligation |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, accumulated benefit obligation | 1,680,600,000 | 1,137,800,000 |
Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, expected contribution to the plan for the next fiscal year | 140,000,000 |  |
Defined benefit plan, accumulated benefit obligation | ₨ 431,600,000 | 339,600,000 |
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% |  |
Lock-in-period after which contribution made for employees stand frozen and will be converted into an annuity on separation | 2 years |  |
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 |  |
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 |  |
Pension | Vested accumulated benefit obligation |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, accumulated benefit obligation | ₨ 409,200,000 | ₨ 223,300,000 |

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- Definition Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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