v3.26.1
Loans, Borrowings and Bank Overdrafts - Summary of Long - Term Loans and Borrowings (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Jun. 23, 2021
Mar. 31, 2026
INR (₨)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
INR (₨)
Mar. 31, 2025
USD ($)
Disclosure of detailed information about borrowings [line items]          
Loans from institutions other than banks   ₨ 1,962   ₨ 0  
Loans received   73,014   63,954  
Non-current portion of long-term loans and borrowings   1,962 $ 21 63,954  
Current portion of long term loans and borrowings   (71,052)   0  
Unsecured Notes 2026 [member]          
Disclosure of detailed information about borrowings [line items]          
Final maturity June 23, 2026        
Unsecured Notes 2026 [member] | U.S.Dollar [member]          
Disclosure of detailed information about borrowings [line items]          
Unsecured loans   ₨ 71,052 749 63,954 $ 748
Final maturity   June-26      
Loans From Institutions Other Than Banks [Member] | U.S.Dollar [member]          
Disclosure of detailed information about borrowings [line items]          
Loans from institutions other than banks   ₨ 1,962 $ 21 ₨ 0 $ 0
Final maturity   June-27