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Financial instruments (Details 4) - Mar. 31, 2021 - Currency swap contract [member]
₨ in Thousands, $ in Thousands
INR (₨)
USD ($)
Disclosure of financial assets [line items]    
Value of the outstanding term loan ₨ 3,675,000 $ 50,000
Tranche one [Member]    
Disclosure of financial assets [line items]    
Value of the outstanding term loan 1,470,000 20,000
Tranche two undrawn [Member]    
Disclosure of financial assets [line items]    
Value of the outstanding term loan ₨ 2,205,000 $ 30,000