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Plan Investment Assets for Gratuity Funds and Pension Fund Measured at Fair Value by Level and in Total (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2017 INR (₨) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 INR (₨)
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Fair Value Measurements Using Quoted Prices In Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets at fair value | ₨ 61.2 | $ 1.0 | ₨ 73.3
Fair Value Measurements Using Quoted Prices In Active Markets for Identical Assets (Level 1) | Funds managed by insurance company (1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets at fair value | 0.0 |  | 0.0
Fair Value Measurements Using Quoted Prices In Active Markets for Identical Assets (Level 1) | Funds managed by insurance company (2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets at fair value | 0.0 |  | 0.0
Fair Value Measurements Using Quoted Prices In Active Markets for Identical Assets (Level 1) | Funds managed by trust | Government Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets at fair value | 0.0 |  | 0.0
Fair Value Measurements Using Quoted Prices In Active Markets for Identical Assets (Level 1) | Funds managed by trust | Debenture and bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets at fair value | 0.0 |  | 0.0
Fair Value Measurements Using Quoted Prices In Active Markets for Identical Assets (Level 1) | Funds managed by trust | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets at fair value | 61.2 |  | 73.3
Fair Value Measurements Using Significant other observable inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets at fair value | 3,744.9 | 57.8 | 2,758.6
Fair Value Measurements Using Significant other observable inputs (Level 2) | Funds managed by insurance company (1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets at fair value | 0.0 |  | 0.0
Fair Value Measurements Using Significant other observable inputs (Level 2) | Funds managed by insurance company (2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets at fair value | 3,186.0 |  | 2,202.1
Fair Value Measurements Using Significant other observable inputs (Level 2) | Funds managed by trust | Government Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets at fair value | 114.7 |  | 112.1
Fair Value Measurements Using Significant other observable inputs (Level 2) | Funds managed by trust | Debenture and bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets at fair value | 444.2 |  | 444.4
Fair Value Measurements Using Significant other observable inputs (Level 2) | Funds managed by trust | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets at fair value | 0.0 |  | 0.0
Fair Value Measurements Using Significant unobservable inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets at fair value | 457.7 | $ 7.1 | 431.2
Fair Value Measurements Using Significant unobservable inputs (Level 3) | Funds managed by insurance company (1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets at fair value | 457.7 |  | 431.2
Fair Value Measurements Using Significant unobservable inputs (Level 3) | Funds managed by insurance company (2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets at fair value | 0.0 |  | 0.0
Fair Value Measurements Using Significant unobservable inputs (Level 3) | Funds managed by trust | Government Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets at fair value | 0.0 |  | 0.0
Fair Value Measurements Using Significant unobservable inputs (Level 3) | Funds managed by trust | Debenture and bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets at fair value | 0.0 |  | 0.0
Fair Value Measurements Using Significant unobservable inputs (Level 3) | Funds managed by trust | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets at fair value | ₨ 0.0 |  | ₨ 0.0

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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