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Financial Instruments - Summary of Fair Value Hierarchy of Assets and Liabilities Measured at Fair Value of Recurring Basis (Detail) - Fair value measurements at reporting date using [member] - INR (₨)
₨ in Millions
Mar. 31, 2018
Mar. 31, 2017
Contingent consideration [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial liabilities   ₨ (339)
Cash flow hedges [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets ₨ 1,139 7,307
Fair value of financial liabilities (1,276) (55)
Level 2 [member] | Cash flow hedges [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 1,139 7,307
Fair value of financial liabilities (1,276) (55)
Level 3 [member] | Contingent consideration [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial liabilities   (339)
Derivative Assets - Others [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 134 2,546
Fair value of financial liabilities (941) (2,655)
Derivative Assets - Others [member] | Level 2 [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 134 2,120
Fair value of financial liabilities (941) (2,655)
Derivative Assets - Others [member] | Level 3 [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets   426
Investment in liquid and short-term mutual funds [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 46,438 104,675
Investment in liquid and short-term mutual funds [member] | Level 1 [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 46,438 104,675
Other Investments [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets   569
Other Investments [member] | Level 2 [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets   569
Investments in equity instruments [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 5,685 5,303
Investments in equity instruments [member] | Level 3 [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 5,685 5,303
Commercial paper, certificate of deposits and bonds [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 176,234 145,614
Commercial paper, certificate of deposits and bonds [member] | Level 1 [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 1,951  
Commercial paper, certificate of deposits and bonds [member] | Level 2 [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets ₨ 174,283 ₨ 145,614