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Significant Transactions with Related Parties Included in Determination of Net Income (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, 2015 INR (₨)
Related Party Transaction [Line Items] |  |  |  |
Interest expense-Deposits | ₨ (173.4) | $ (2.7) | ₨ (285.3) | ₨ (300.8)
Non-Interest Revenue-Fees and Commissions |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction revenues | 12,430.9 | 191.7 | 11,366.4 | 8,552.5
Interest and Dividend |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction revenues | 37.2 | 0.6 | 22.9 | 73.4
Administrative and other expense |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction non-interest expense | (4,987.9) | (76.9) | (3,794.7) | (2,400.9)
Premises and equipment expense |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction non-interest expense | (33.0) | $ (0.5) | (28.1) | (27.6)
Principal Owner |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Interest expense-Deposits | (55.7) |  | (72.5) | (76.0)
Principal Owner | Non-Interest Revenue-Fees and Commissions |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction revenues | 2,074.5 |  | 1,788.3 | 1,443.7
Principal Owner | Interest and Dividend |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction revenues | 0.0 |  | 0.0 | 0.0
Principal Owner | Administrative and other expense |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction non-interest expense | (3,405.7) |  | (2,451.6) | (1,377.9)
Principal Owner | Premises and equipment expense |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction non-interest expense | (25.3) |  | (20.5) | (20.4)
Others |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Interest expense-Deposits | (117.7) |  | (212.8) | (224.8)
Others | Non-Interest Revenue-Fees and Commissions |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction revenues | 10,356.4 |  | 9,578.1 | 7,108.8
Others | Interest and Dividend |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction revenues | 37.2 |  | 22.9 | 73.4
Others | Administrative and other expense |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction non-interest expense | (1,582.2) |  | (1,343.1) | (1,023.0)
Others | Premises and equipment expense |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction non-interest expense | ₨ (7.7) |  | ₨ (7.6) | ₨ (7.2)

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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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- Definition Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999 + Details
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