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Commitments and Contingencies - Additional Information (Detail) - INR (₨) ₨ in Millions | Mar. 31, 2018 | Mar. 31, 2017
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Loss Contingencies [Line Items] |  |
Capital commitments, estimated amounts of contracts remaining to be executed on the capital account | ₨ 5,196.7 | ₨ 4,010.7
Indirect Taxes And Other Claims |  |
Loss Contingencies [Line Items] |  |
Contingencies, estimated possible loss | ₨ 8,398.3 | ₨ 7,759.1

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