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Expenses by Nature - Summary of Expenses by Nature (Detail) - INR (₨)
₨ in Millions
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Expenses by nature [abstract]      
Employee compensation ₨ 299,774 ₨ 272,223 ₨ 268,081
Sub-contracting/ technical fees 94,725 84,437 82,747
Cost of hardware and software 13,567 18,985 27,216
Travel 17,768 17,399 20,147
Facility expenses 22,213 21,044 19,297
Depreciation, amortization and impairment 19,474 21,124 23,107
Communication 4,561 5,353 5,370
Legal and professional fees 4,361 4,690 4,957
Rates, taxes and insurance 1,621 2,400 2,261
Marketing and brand building 2,714 3,140 2,936
Lifetime expected credit loss and provision for deferred contract cost 980 6,565 2,427
Miscellaneous expenses 11,736 4,705 5,836
Total cost of revenues, selling and marketing expenses and general and administrative expenses ₨ 493,494 ₨ 462,065 ₨ 464,382