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Financial Instruments - Summary of Foreign Currency Risk from Non-derivative Financial Instruments (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Apr. 01, 2019
INR (₨)
Mar. 31, 2019
INR (₨)
Mar. 31, 2018
INR (₨)
Disclosure of foreign currency exchange risk on financial instruments [line items]          
Trade receivables ₨ 110,523     ₨ 104,862  
Cash and cash equivalents 144,499 $ 1,917   158,529 ₨ 44,925
Other assets 14,495     19,757  
Loans, borrowings and bank overdrafts (78,042)     (99,467)  
Lease liabilities (19,198)   ₨ (15,379)    
Currency risk [member]          
Disclosure of foreign currency exchange risk on financial instruments [line items]          
Trade receivables 67,878     62,088  
Unbilled receivables 16,579     14,965  
Contract assets 11,516     10,005  
Cash and cash equivalents 22,767     31,589  
Other assets 61,097     20,397  
Loans, borrowings and bank overdrafts (36,578)     (50,611)  
Lease liabilities (8,014)        
Trade payables, accrued expenses and other liabilities (39,514)     (42,746)  
Net assets/ (liabilities) 95,731     45,687  
U.S.Dollar [member]          
Disclosure of foreign currency exchange risk on financial instruments [line items]          
Trade receivables 42,329     39,896  
Unbilled receivables 11,127     8,038  
Contract assets 5,517     4,706  
Cash and cash equivalents 13,481     21,997  
Other assets 49,835     8,553  
Loans, borrowings and bank overdrafts (36,578)     (50,516)  
Lease liabilities (3,393)        
Trade payables, accrued expenses and other liabilities (27,457)     (27,202)  
Net assets/ (liabilities) 54,861     5,472  
EURO [member]          
Disclosure of foreign currency exchange risk on financial instruments [line items]          
Trade receivables 8,860     8,030  
Unbilled receivables 1,030     1,609  
Contract assets 1,559     1,445  
Cash and cash equivalents 3,978     2,884  
Other assets 4,314     1,173  
Loans, borrowings and bank overdrafts       (20)  
Lease liabilities (2,606)        
Trade payables, accrued expenses and other liabilities (3,419)     (5,779)  
Net assets/ (liabilities) 13,716     9,342  
Great British Pound [member]          
Disclosure of foreign currency exchange risk on financial instruments [line items]          
Trade receivables 7,735     5,212  
Unbilled receivables 2,221     3,146  
Contract assets 2,850     2,270  
Cash and cash equivalents 1,697     1,573  
Other assets 3,283     4,056  
Loans, borrowings and bank overdrafts       (21)  
Lease liabilities (373)        
Trade payables, accrued expenses and other liabilities (3,718)     (4,646)  
Net assets/ (liabilities) 13,695     11,590  
Australian Dollar [member]          
Disclosure of foreign currency exchange risk on financial instruments [line items]          
Trade receivables 3,044     3,542  
Unbilled receivables 784     1,225  
Contract assets 654     836  
Cash and cash equivalents 586     1,003  
Other assets 413     1,038  
Loans, borrowings and bank overdrafts       (33)  
Lease liabilities (214)        
Trade payables, accrued expenses and other liabilities (1,228)     (1,526)  
Net assets/ (liabilities) 4,039     6,085  
Canadian Dollar [member]          
Disclosure of foreign currency exchange risk on financial instruments [line items]          
Trade receivables 1,388     1,528  
Unbilled receivables 291     204  
Contract assets 146     150  
Cash and cash equivalents 1,292     1,928  
Other assets 1,447     1,033  
Lease liabilities (16)        
Trade payables, accrued expenses and other liabilities (605)     (806)  
Net assets/ (liabilities) 3,943     4,037  
Other currencies [member]          
Disclosure of foreign currency exchange risk on financial instruments [line items]          
Trade receivables 4,522     3,880  
Unbilled receivables 1,126     743  
Contract assets 790     598  
Cash and cash equivalents 1,733     2,204  
Other assets 1,805     4,544  
Loans, borrowings and bank overdrafts       (21)  
Lease liabilities (1,412)        
Trade payables, accrued expenses and other liabilities (3,087)     (2,787)  
Net assets/ (liabilities) ₨ 5,477     ₨ 9,161