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Revenue - Schedule of Disaggregation of Revenues (Detail) - INR (₨)
₨ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue ₨ 610,232 ₨ 585,845
Fixed-price contracts [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 369,334 349,985
Time-and-materials contracts [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 229,216 221,316
India [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 30,215 30,999
Americas [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 350,427 323,659
Europe [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 144,072 146,190
Rest of the World [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 85,518 84,997
IT services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 590,589 563,336
IT services [member] | Fixed-price contracts [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 362,919 343,809
IT services [member] | Time-and-materials contracts [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 227,670 219,527
IT services [member] | India [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 15,579 14,880
IT services [member] | Americas [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 349,509 321,547
IT services [member] | Europe [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 141,682 143,950
IT services [member] | Rest of the World [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 83,819 82,959
IT Products [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 11,682 14,544
IT Products [member] | India [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 6,675 8,154
IT Products [member] | Americas [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 918 2,112
IT Products [member] | Europe [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 2,390 2,240
IT Products [member] | Rest of the World [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 1,699 2,038
India State Run Enterprise (ISRE) [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 7,961 7,965
India State Run Enterprise (ISRE) [member] | Fixed-price contracts [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 6,415 6,176
India State Run Enterprise (ISRE) [member] | Time-and-materials contracts [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 1,546 1,789
India State Run Enterprise (ISRE) [member] | India [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 7,961 7,965
Rendering of Services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 598,550 571,301
Rendering of Services [member] | IT services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 590,589 563,336
Rendering of Services [member] | India State Run Enterprise (ISRE) [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 7,961 7,965
Sales of Products [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 11,682 14,544
Sales of Products [member] | IT Products [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 11,682 14,544
Products [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 11,682 14,544
Products [member] | IT Products [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 11,682 14,544
Banking Financial Services and Insurance (BFSI) [member] | IT services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 183,368 173,516
Banking Financial Services and Insurance (BFSI) [member] | IT services [member] | Fixed-price contracts [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 101,875 89,378
Banking Financial Services and Insurance (BFSI) [member] | IT services [member] | Time-and-materials contracts [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 81,493 84,138
Banking Financial Services and Insurance (BFSI) [member] | IT services [member] | India [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 5,241 3,868
Banking Financial Services and Insurance (BFSI) [member] | IT services [member] | Americas [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 107,467 98,428
Banking Financial Services and Insurance (BFSI) [member] | IT services [member] | Europe [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 45,067 46,856
Banking Financial Services and Insurance (BFSI) [member] | IT services [member] | Rest of the World [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 25,593 24,364
Banking Financial Services and Insurance (BFSI) [member] | Rendering of Services [member] | IT services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 183,368 173,516
Healthcare and Lifesciences (Health BU) [member] | IT services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 77,794 73,942
Healthcare and Lifesciences (Health BU) [member] | IT services [member] | Fixed-price contracts [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 49,951 53,462
Healthcare and Lifesciences (Health BU) [member] | IT services [member] | Time-and-materials contracts [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 27,843 20,480
Healthcare and Lifesciences (Health BU) [member] | IT services [member] | India [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 2,522 2,295
Healthcare and Lifesciences (Health BU) [member] | IT services [member] | Americas [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 60,245 57,204
Healthcare and Lifesciences (Health BU) [member] | IT services [member] | Europe [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 7,540 7,591
Healthcare and Lifesciences (Health BU) [member] | IT services [member] | Rest of the World [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 7,487 6,852
Healthcare and Lifesciences (Health BU) [member] | Rendering of Services [member] | IT services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 77,794 73,942
Consumer Business Unit (CBU) [member] | IT services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 96,509 88,797
Consumer Business Unit (CBU) [member] | IT services [member] | Fixed-price contracts [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 53,575 50,425
Consumer Business Unit (CBU) [member] | IT services [member] | Time-and-materials contracts [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 42,934 38,372
Consumer Business Unit (CBU) [member] | IT services [member] | India [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 1,025 1,006
Consumer Business Unit (CBU) [member] | IT services [member] | Americas [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 67,988 59,262
Consumer Business Unit (CBU) [member] | IT services [member] | Europe [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 17,275 17,636
Consumer Business Unit (CBU) [member] | IT services [member] | Rest of the World [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 10,221 10,893
Consumer Business Unit (CBU) [member] | Rendering of Services [member] | IT services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 96,509 88,797
Energy, Natural Resources and Utilities (ENU) [member] | IT services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 75,958 72,329
Energy, Natural Resources and Utilities (ENU) [member] | IT services [member] | Fixed-price contracts [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 52,084 51,799
Energy, Natural Resources and Utilities (ENU) [member] | IT services [member] | Time-and-materials contracts [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 23,874 20,530
Energy, Natural Resources and Utilities (ENU) [member] | IT services [member] | India [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 1,832 1,690
Energy, Natural Resources and Utilities (ENU) [member] | IT services [member] | Americas [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 24,315 22,739
Energy, Natural Resources and Utilities (ENU) [member] | IT services [member] | Europe [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 31,090 29,795
Energy, Natural Resources and Utilities (ENU) [member] | IT services [member] | Rest of the World [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 18,721 18,105
Energy, Natural Resources and Utilities (ENU) [member] | Rendering of Services [member] | IT services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 75,958 72,329
Technology segment [member] | IT services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 75,446 76,108
Technology segment [member] | IT services [member] | Fixed-price contracts [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 49,733 47,055
Technology segment [member] | IT services [member] | Time-and-materials contracts [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 25,713 29,053
Technology segment [member] | IT services [member] | India [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 942 1,392
Technology segment [member] | IT services [member] | Americas [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 57,092 54,679
Technology segment [member] | IT services [member] | Europe [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 14,107 16,441
Technology segment [member] | IT services [member] | Rest of the World [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 3,305 3,596
Technology segment [member] | Rendering of Services [member] | IT services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 75,446 76,108
Manufacturing Segment [member] | IT services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 47,859 46,155
Manufacturing Segment [member] | IT services [member] | Fixed-price contracts [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 33,793 31,843
Manufacturing Segment [member] | IT services [member] | Time-and-materials contracts [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 14,066 14,312
Manufacturing Segment [member] | IT services [member] | India [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 1,908 1,534
Manufacturing Segment [member] | IT services [member] | Americas [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 23,327 21,541
Manufacturing Segment [member] | IT services [member] | Europe [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 18,547 18,211
Manufacturing Segment [member] | IT services [member] | Rest of the World [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 4,077 4,869
Manufacturing Segment [member] | Rendering of Services [member] | IT services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 47,859 46,155
Communications (COMM) [member] | IT services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 33,655 32,489
Communications (COMM) [member] | IT services [member] | Fixed-price contracts [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 21,908 19,847
Communications (COMM) [member] | IT services [member] | Time-and-materials contracts [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 11,747 12,642
Communications (COMM) [member] | IT services [member] | India [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 2,109 3,095
Communications (COMM) [member] | IT services [member] | Americas [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 9,075 7,694
Communications (COMM) [member] | IT services [member] | Europe [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 8,056 7,420
Communications (COMM) [member] | IT services [member] | Rest of the World [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 14,415 14,280
Communications (COMM) [member] | Rendering of Services [member] | IT services [member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue ₨ 33,655 ₨ 32,489