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Net Gratuity Cost (Detail) - Gratuity ₨ 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 (₨)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | ₨ 741.0 | $ 11.4 | ₨ 860.6 | ₨ 513.3
Interest cost | 392.2 | 6.0 | 454.6 | 256.1
Expected return on plan assets | (297.4) | (4.6) | (389.7) | (212.3)
Actuarial (gains)/losses | 85.1 | 1.3 | 287.6 | 95.2
Net gratuity cost | ₨ 920.9 | $ 14.1 | ₨ 1,213.1 | ₨ 652.3

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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