v3.26.1
Revenue - Schedule of Disaggregation of Revenues (Detail) - INR (₨)
₨ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue ₨ 926,240 ₨ 890,884 ₨ 897,603
Fixed-price and volume based contracts [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 481,768 480,920 501,947
Time-and-materials contracts [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 437,532 407,272 391,529
IT services [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 919,300 888,192 893,476
IT services [member] | Fixed-price and volume based contracts [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 481,768 480,920 501,947
IT services [member] | Time-and-materials contracts [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 437,532 407,272 391,529
IT services [member] | Americas1 [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 305,036 281,806 268,131
IT services [member] | Americas1 [Member] | Fixed-price and volume based contracts [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 153,658 144,904 150,253
IT services [member] | Americas1 [Member] | Time-and-materials contracts [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 151,378 136,902 117,878
IT services [member] | Americas2 [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 268,532 271,965 269,387
IT services [member] | Americas2 [Member] | Fixed-price and volume based contracts [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 126,105 137,385 140,676
IT services [member] | Americas2 [Member] | Time-and-materials contracts [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 142,427 134,580 128,711
IT services [member] | Europe [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 243,645 240,187 253,817
IT services [member] | Europe [member] | Fixed-price and volume based contracts [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 139,795 142,241 149,007
IT services [member] | Europe [member] | Time-and-materials contracts [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 103,850 97,946 104,810
IT services [member] | APMEA [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 102,087 94,234 102,141
IT services [member] | APMEA [member] | Fixed-price and volume based contracts [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 62,210 56,390 62,011
IT services [member] | APMEA [member] | Time-and-materials contracts [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 39,877 37,844 40,130
IT products [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 6,940 2,692 4,127
IT products [member] | Fixed-price and volume based contracts [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0 0 0
IT products [member] | Time-and-materials contracts [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0 0 0
Rendering of services [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 919,300 888,192 893,476
Rendering of services [member] | IT services [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 919,300 888,192 893,476
Rendering of services [member] | IT services [member] | Americas1 [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 305,036 281,806 268,131
Rendering of services [member] | IT services [member] | Americas2 [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 268,532 271,965 269,387
Rendering of services [member] | IT services [member] | Europe [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 243,645 240,187 253,817
Rendering of services [member] | IT services [member] | APMEA [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 102,087 94,234 102,141
Rendering of services [member] | IT products [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0 0 0
Sales of products [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 6,940 2,692 4,127
Sales of products [member] | IT services [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0 0 0
Sales of products [member] | IT services [member] | Americas1 [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0 0 0
Sales of products [member] | IT services [member] | Americas2 [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0 0 0
Sales of products [member] | IT services [member] | Europe [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0 0 0
Sales of products [member] | IT services [member] | APMEA [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0 0 0
Sales of products [member] | IT products [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 6,940 2,692 4,127
Products [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 6,940 2,692 4,127
Products [member] | IT services [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0 0 0
Products [member] | IT services [member] | Americas1 [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0 0 0
Products [member] | IT services [member] | Americas2 [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0 0 0
Products [member] | IT services [member] | Europe [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0 0 0
Products [member] | IT services [member] | APMEA [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 0 0 0
Products [member] | IT products [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 6,940 2,692 4,127
Banking, Financial Services and Insurance [member] | IT services [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 314,011 304,253 298,701
Banking, Financial Services and Insurance [member] | IT services [member] | Americas1 [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 842 1,240 2,462
Banking, Financial Services and Insurance [member] | IT services [member] | Americas2 [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 170,299 172,817 165,002
Banking, Financial Services and Insurance [member] | IT services [member] | Europe [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 96,587 91,965 95,475
Banking, Financial Services and Insurance [member] | IT services [member] | APMEA [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 46,283 38,231 35,762
Health [member] | IT services [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 133,848 125,795 118,311
Health [member] | IT services [member] | Americas1 [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 116,104 108,305 95,496
Health [member] | IT services [member] | Americas2 [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 1,408 236 162
Health [member] | IT services [member] | Europe [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 12,944 13,982 17,699
Health [member] | IT services [member] | APMEA [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 3,392 3,272 4,954
Consumer [member] | IT services [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 168,970 169,313 167,212
Consumer [member] | IT services [member] | Americas1 [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 107,075 103,875 102,439
Consumer [member] | IT services [member] | Americas2 [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 3,772 6,659 5,351
Consumer [member] | IT services [member] | Europe [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 44,537 43,435 43,035
Consumer [member] | IT services [member] | APMEA [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 13,586 15,344 16,387
Technology and Communications | IT services [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 146,553 135,899 [1] 142,158 [1]
Technology and Communications | IT services [member] | Americas1 [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 74,591 64,907 [1] 66,326 [1]
Technology and Communications | IT services [member] | Americas2 [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 22,195 24,255 [1] 25,220 [1]
Technology and Communications | IT services [member] | Europe [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 35,329 31,804 [1] 30,961 [1]
Technology and Communications | IT services [member] | APMEA [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 14,438 14,933 [1] 19,651 [1]
Energy, Manufacturing and Resources [member] | IT services [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 155,918 152,932 [1] 167,094 [1]
Energy, Manufacturing and Resources [member] | IT services [member] | Americas1 [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 6,424 3,479 [1] 1,408 [1]
Energy, Manufacturing and Resources [member] | IT services [member] | Americas2 [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 70,858 67,998 [1] 73,652 [1]
Energy, Manufacturing and Resources [member] | IT services [member] | Europe [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue 54,248 59,001 [1] 66,647 [1]
Energy, Manufacturing and Resources [member] | IT services [member] | APMEA [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue ₨ 24,388 ₨ 22,454 [1] ₨ 25,387 [1]
[1] Effective October 1, 2024, the Company has reorganized its sectors by merging “Technology” and “Communications” into “Technology and Communications” sector, and by merging “Energy, Natural Resources and Utilities” and “Manufacturing” into “Energy, Manufacturing and Resources” sector. Comparative period disaggregation of revenue has been restated to give effect to this change.