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Impaired Loans Where Bank is Probable that it will not Collect all Amounts due According to Original Contractual Terms of Loans (Detail) ₨ in Millions, $ in Millions | 12 Months Ended |
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Mar. 31, 2017 INR (₨) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 INR (₨) | Mar. 31, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investments | ₨ 82,979.7 |  | ₨ 52,982.7 | $ 1,279.6
Unpaid principal balance | 82,979.7 |  | 52,982.7 | 1,279.6
Related specific allowance | 45,730.1 |  | 31,008.1 | 705.2
Average recorded investments | 67,981.4 | $ 1,048.3 | 46,154.0 |
Finance receivable on non-accrual status | 82,979.7 |  | 48,691.4 | $ 1,279.6
Retail Loans | Auto loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investments | 6,105.6 |  | 4,494.5 |
Unpaid principal balance | 6,105.6 |  | 4,494.5 |
Related specific allowance | 2,792.9 |  | 2,101.1 |
Average recorded investments | 5,300.1 |  | 3,606.6 |
Finance receivable on non-accrual status | 6,105.6 |  | 4,494.5 |
Retail Loans | Personal loans/Credit card |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investments | 6,467.4 |  | 4,441.6 |
Unpaid principal balance | 6,467.4 |  | 4,441.6 |
Related specific allowance | 4,040.0 |  | 2,638.6 |
Average recorded investments | 5,454.5 |  | 3,545.0 |
Finance receivable on non-accrual status | 6,467.4 |  | 4,441.6 |
Retail Loans | Retail Business Banking |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investments | 21,060.1 |  | 15,486.0 |
Unpaid principal balance | 21,060.1 |  | 15,486.0 |
Related specific allowance | 15,278.4 |  | 10,617.5 |
Average recorded investments | 18,273.1 |  | 12,749.3 |
Finance receivable on non-accrual status | 21,060.1 |  | 15,485.5 |
Retail Loans | Commercial vehicle and construction equipment finance |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investments | 6,086.6 |  | 5,150.7 |
Unpaid principal balance | 6,086.6 |  | 5,150.7 |
Related specific allowance | 4,398.5 |  | 3,876.7 |
Average recorded investments | 5,618.7 |  | 5,355.1 |
Finance receivable on non-accrual status | 6,086.6 |  | 5,150.7 |
Retail Loans | Housing loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investments | 1,678.2 |  | 1,068.6 |
Unpaid principal balance | 1,678.2 |  | 1,068.6 |
Related specific allowance | 739.3 |  | 410.4 |
Average recorded investments | 1,373.4 |  | 655.7 |
Finance receivable on non-accrual status | 1,678.2 |  | 1,068.6 |
Retail Loans | Other Retail |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investments | 11,306.1 |  | 6,781.6 |
Unpaid principal balance | 11,306.1 |  | 6,781.6 |
Related specific allowance | 6,767.5 |  | 3,950.4 |
Average recorded investments | 9,043.9 |  | 5,717.6 |
Finance receivable on non-accrual status | 11,306.1 |  | 6,781.6 |
Wholesale loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investments | 30,275.7 |  | 15,559.7 |
Unpaid principal balance | 30,275.7 |  | 15,559.7 |
Related specific allowance | 11,713.5 |  | 7,413.4 |
Average recorded investments | 22,917.7 |  | 14,524.7 |
Finance receivable on non-accrual status | ₨ 30,275.7 |  | ₨ 11,268.9 |

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