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Loans, Borrowings and Bank Overdrafts - Additional Information (Detail)
€ in Millions, ₨ in Millions, Rp in Millions, $ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2019
INR (₨)
Mar. 31, 2018
INR (₨)
Mar. 31, 2017
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2019
CAD ($)
Mar. 31, 2019
EUR (€)
Mar. 31, 2019
IDR (Rp)
Disclosure of detailed information about borrowings [line items]              
Obligations under finance leases ₨ 2,002 ₨ 5,442          
Interest expense on borrowings ₨ 4,058 3,045 ₨ 1,916        
Bottom of range [member]              
Disclosure of detailed information about borrowings [line items]              
Finance lease contract term 1 year            
Top of range [member]              
Disclosure of detailed information about borrowings [line items]              
Finance lease contract term 5 years            
Bank overdraft [member]              
Disclosure of detailed information about borrowings [line items]              
Short-term borrowings ₨ 68,085 79,598          
Line of credit [member]              
Disclosure of detailed information about borrowings [line items]              
Short-term borrowings 7,979            
Line of credit [member] | U.S.Dollar [member]              
Disclosure of detailed information about borrowings [line items]              
Short-term borrowings | $       $ 1,410      
Remaining borrowing capacity | $       $ 440      
Line of credit [member] | Canadian Dollar [member]              
Disclosure of detailed information about borrowings [line items]              
Short-term borrowings | $         $ 57    
Remaining borrowing capacity | $         $ 38    
Line of credit [member] | EURO [member]              
Disclosure of detailed information about borrowings [line items]              
Short-term borrowings | €           € 20  
Remaining borrowing capacity | €           € 20  
Line of credit [member] | Indonesia, Rupiahs              
Disclosure of detailed information about borrowings [line items]              
Short-term borrowings | Rp             Rp 13,000
Remaining borrowing capacity | Rp             Rp 13,000
Line of credit [member] | Indian Rupee [member]              
Disclosure of detailed information about borrowings [line items]              
Remaining borrowing capacity 7,957            
Revolving credit facilities non-fund based [member]              
Disclosure of detailed information about borrowings [line items]              
Short-term borrowings 40,470 44,022          
Remaining borrowing capacity ₨ 22,014 ₨ 22,476