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Significant Accounting Policies - Schedule of Disaggregation of Revenues (Detail)
₨ in Millions
12 Months Ended
Mar. 31, 2019
INR (₨)
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue ₨ 585,845
Fixed-price contracts [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 349,985
Time-and-materials contracts [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 221,316
India [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 30,999
Americas [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 323,659
Europe [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 146,190
Rest of the World [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 84,997
IT services [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 563,336
IT services [member] | Fixed-price contracts [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 343,809
IT services [member] | Time-and-materials contracts [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 219,527
IT services [member] | India [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 14,880
IT services [member] | Americas [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 321,547
IT services [member] | Europe [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 143,950
IT services [member] | Rest of the World [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 82,959
Products [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 14,544
Products [member] | India [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 8,154
Products [member] | Americas [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 2,112
Products [member] | Europe [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 2,240
Products [member] | Rest of the World [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 2,038
India State Run Enterprise (ISRE) [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 7,965
India State Run Enterprise (ISRE) [member] | Fixed-price contracts [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 6,176
India State Run Enterprise (ISRE) [member] | Time-and-materials contracts [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 1,789
India State Run Enterprise (ISRE) [member] | India [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 7,965
Rendering of Services [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 571,301
Rendering of Services [member] | IT services [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 563,336
Rendering of Services [member] | India State Run Enterprise (ISRE) [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 7,965
Sales of Products [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 14,544
Sales of Products [member] | Products [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 14,544
Products [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 14,544
Products [member] | Products [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 14,544
Banking Financial Services and Insurance (BFSI) [member] | IT services [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 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 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 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 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 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 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 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 173,516
Healthcare and Lifesciences (HLS) [member] | IT services [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 73,942
Healthcare and Lifesciences (HLS) [member] | IT services [member] | Fixed-price contracts [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 53,462
Healthcare and Lifesciences (HLS) [member] | IT services [member] | Time-and-materials contracts [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 20,480
Healthcare and Lifesciences (HLS) [member] | IT services [member] | India [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 2,295
Healthcare and Lifesciences (HLS) [member] | IT services [member] | Americas [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 57,204
Healthcare and Lifesciences (HLS) [member] | IT services [member] | Europe [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 7,591
Healthcare and Lifesciences (HLS) [member] | IT services [member] | Rest of the World [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 6,852
Healthcare and Lifesciences (HLS) [member] | Rendering of Services [member] | IT services [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 73,942
Consumer Business Unit (CBU) [member] | IT services [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 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 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 38,372
Consumer Business Unit (CBU) [member] | IT services [member] | India [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 1,006
Consumer Business Unit (CBU) [member] | IT services [member] | Americas [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 59,262
Consumer Business Unit (CBU) [member] | IT services [member] | Europe [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 17,636
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 10,893
Consumer Business Unit (CBU) [member] | Rendering of Services [member] | IT services [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 88,797
Energy, Natural Resources and Utilities (ENU) [member] | IT services [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 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 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 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 1,690
Energy, Natural Resources and Utilities (ENU) [member] | IT services [member] | Americas [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 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 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 18,105
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 72,329
Technology segment [member] | IT services [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 76,108
Technology segment [member] | IT services [member] | Fixed-price contracts [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 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 29,053
Technology segment [member] | IT services [member] | India [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 1,392
Technology segment [member] | IT services [member] | Americas [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 54,679
Technology segment [member] | IT services [member] | Europe [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 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 3,596
Technology segment [member] | Rendering of Services [member] | IT services [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 76,108
Manufacturing Segment [member] | IT services [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 46,155
Manufacturing Segment [member] | IT services [member] | Fixed-price contracts [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 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 14,312
Manufacturing Segment [member] | IT services [member] | India [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 1,534
Manufacturing Segment [member] | IT services [member] | Americas [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 21,541
Manufacturing Segment [member] | IT services [member] | Europe [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 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 4,869
Manufacturing Segment [member] | Rendering of Services [member] | IT services [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 46,155
Communications (COMM) [member] | IT services [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 32,489
Communications (COMM) [member] | IT services [member] | Fixed-price contracts [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 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 12,642
Communications (COMM) [member] | IT services [member] | India [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 3,095
Communications (COMM) [member] | IT services [member] | Americas [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 7,694
Communications (COMM) [member] | IT services [member] | Europe [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue 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 14,280
Communications (COMM) [member] | Rendering of Services [member] | IT services [member]  
Disclosure of disaggregation of revenue from contracts with customers [line items]  
Revenue ₨ 32,489