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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, 2018 INR (₨) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 INR (₨) | Mar. 31, 2016 INR (₨)
Related Party Transaction [Line Items] |  |  |  |
Interest expense-Deposits | ₨ (175.5) | $ (2.7) | ₨ (173.4) | ₨ (285.3)
Non-Interest Revenue-Fees and Commissions |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction revenues | 17,556.2 | 269.6 | 12,430.9 | 11,366.4
Interest and Dividend |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction revenues | 1,529.7 | 23.5 | 37.2 | 22.9
Administrative and other expense |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction non-interest expense | (6,298.7) | (96.7) | (4,987.9) | (3,794.7)
Premises and equipment expense |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction non-interest expense | (27.4) | $ (0.4) | (33.0) | (28.1)
Principal Owner |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Interest expense-Deposits | (59.6) |  | (55.7) | (72.5)
Principal Owner | Non-Interest Revenue-Fees and Commissions |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction revenues | 2,642.7 |  | 2,074.5 | 1,788.3
Principal Owner | Interest and Dividend |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction revenues | 132.8 |  |  |
Principal Owner | Administrative and other expense |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction non-interest expense | (4,031.9) |  | (3,405.7) | (2,451.6)
Principal Owner | Premises and equipment expense |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction non-interest expense | (19.8) |  | (25.3) | (20.5)
Others |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Interest expense-Deposits | (115.9) |  | (117.7) | (212.8)
Others | Non-Interest Revenue-Fees and Commissions |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction revenues | 14,913.5 |  | 10,356.4 | 9,578.1
Others | Interest and Dividend |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction revenues | 1,396.9 |  | 37.2 | 22.9
Others | Administrative and other expense |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction non-interest expense | (2,266.8) |  | (1,582.2) | (1,343.1)
Others | Premises and equipment expense |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction non-interest expense | ₨ (7.6) |  | ₨ (7.7) | ₨ (7.6)

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI http://asc.fasb.org/extlink&oid=114873854&loc=SL114874292-224272 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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