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Commitments and Contingencies - Additional Information (Detail) ₨ in Millions, $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2021 INR (₨) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 INR (₨)
Loss Contingencies [Line Items] |  |  |
Capital commitments, estimated amounts of contracts remaining to be executed on the capital account | ₨ 12,895.7 |  | ₨ 12,756.9
Additional operating lease commitments with leases which have not yet commenced | 187.8 |  |
Operating lease expense | ₨ 12,820.3 | $ 175.3 | 11,692.3
Minimum [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Additional operating lease commitments with leases which have not yet commenced, lease term | 9 years |  |
Maximum [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Additional operating lease commitments with leases which have not yet commenced, lease term | 15 years |  |
Indirect Taxes And Other Claims |  |  |
Loss Contingencies [Line Items] |  |  |
Contingencies, estimated possible loss | ₨ 8,437.8 |  | ₨ 10,203.1

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