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Expenses by Nature - Summary of Expenses by Nature (Detail) - INR (₨)
₨ in Millions
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Expenses by nature [abstract]      
Employee compensation ₨ 272,223 ₨ 268,081 ₨ 245,534
Sub-contracting/ technical fees 84,437 82,747 67,769
Cost of hardware and software 18,985 27,216 30,096
Travel 17,399 20,147 23,507
Facility expenses 21,044 19,297 16,480
Depreciation, amortization and impairment 21,124 23,107 14,965
Communication 5,353 5,370 4,825
Legal and professional fees 4,690 4,957 4,214
Rates, taxes and insurance 2,400 2,261 2,526
Marketing and brand building 3,140 2,936 2,292
Lifetime expected credit loss and provision for deferred contract cost 6,565 2,427 2,004
Miscellaneous expenses 4,705 5,836 5,235
Total cost of revenues, selling and marketing expenses and general and administrative expenses ₨ 462,065 ₨ 464,382 ₨ 419,447