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Employee benefits (Details 2) - INR (₨)
₨ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Disclosure Of Employee Benefits [Line Items]        
Present value of projected benefit obligation at the end of the year ₨ 131,687 ₨ 109,826    
Funded status of the plans (32,567) (20,712) ₨ (35,589) ₨ (33,135)
Recognized (asset) / liability ₨ 99,120 ₨ 89,114