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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, 2016 INR (₨) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 INR (₨) | Mar. 31, 2016 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investments | ₨ 52,982.7 |  | ₨ 39,324.8 | $ 799.7
Unpaid principal balance | 52,982.7 |  | 39,324.8 | 799.7
Related specific allowance | 31,008.1 |  | 24,709.0 | 468.0
Average recorded investments | 46,154.0 | $ 696.7 | 34,505.8 |
Finance receivable on non-accrual status | 48,691.4 |  | 36,893.6 | $ 735.0
Retail Loans | Auto loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investments | 4,494.5 |  | 2,718.7 |
Unpaid principal balance | 4,494.5 |  | 2,718.7 |
Related specific allowance | 2,101.1 |  | 1,226.0 |
Average recorded investments | 3,606.6 |  | 2,282.0 |
Finance receivable on non-accrual status | 4,494.5 |  | 2,718.7 |
Retail Loans | Personal loans/Credit card |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investments | 4,441.6 |  | 2,648.4 |
Unpaid principal balance | 4,441.6 |  | 2,648.4 |
Related specific allowance | 2,638.6 |  | 1,634.0 |
Average recorded investments | 3,545.0 |  | 2,316.4 |
Finance receivable on non-accrual status | 4,441.6 |  | 2,648.4 |
Retail Loans | Retail Business Banking |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investments | 15,486.0 |  | 10,012.5 |
Unpaid principal balance | 15,486.0 |  | 10,012.5 |
Related specific allowance | 10,617.5 |  | 7,105.6 |
Average recorded investments | 12,749.3 |  | 8,558.6 |
Finance receivable on non-accrual status | 15,485.5 |  | 9,723.4 |
Retail Loans | Commercial vehicle and construction equipment finance |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investments | 5,150.7 |  | 5,559.4 |
Unpaid principal balance | 5,150.7 |  | 5,559.4 |
Related specific allowance | 3,876.7 |  | 3,630.6 |
Average recorded investments | 5,355.1 |  | 5,883.6 |
Finance receivable on non-accrual status | 5,150.7 |  | 5,559.4 |
Retail Loans | Housing loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investments | 1,068.6 |  | 242.7 |
Unpaid principal balance | 1,068.6 |  | 242.7 |
Related specific allowance | 410.4 |  | 127.4 |
Average recorded investments | 655.7 |  | 224.3 |
Finance receivable on non-accrual status | 1,068.6 |  | 242.7 |
Retail Loans | Other Loan |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investments | 6,781.6 |  | 4,653.5 |
Unpaid principal balance | 6,781.6 |  | 4,653.5 |
Related specific allowance | 3,950.4 |  | 2,901.6 |
Average recorded investments | 5,717.6 |  | 4,117.0 |
Finance receivable on non-accrual status | 6,781.6 |  | 4,653.5 |
Wholesale loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investments | 15,559.7 |  | 13,489.6 |
Unpaid principal balance | 15,559.7 |  | 13,489.6 |
Related specific allowance | 7,413.4 |  | 8,083.8 |
Average recorded investments | 14,524.7 |  | 11,123.9 |
Finance receivable on non-accrual status | ₨ 11,268.9 |  | ₨ 11,347.5 |

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