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Reconciliation of All Plan Investment Assets Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Detail) - Plan investment funds managed by insurance companies ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2019 INR (₨) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 INR (₨)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Beginning balance | ₨ 519.9 | $ 7.5 | ₨ 457.7
Realized interest credited to fund | 36.7 | 0.5 | 40.6
Contribution during the period | 88.6 | 1.3 | 93.2
Amount paid towards claim | (20.2) | (0.3) | (71.6)
Ending Balance | ₨ 625.0 | $ 9.0 | ₨ 519.9

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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