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Employee benefits (Details 10) - Industrias Quimicas Falcon de Mexico Pension plan [Member] - INR (₨)
₨ in Millions
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Disclosure of net defined benefit liability (asset) [line items]      
Present value of funded obligations ₨ 271 ₨ 307 ₨ 234
Fair value of plan assets (215) (169) ₨ (128)
Net defined benefit liability recognized ₨ 56 ₨ 138