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Other investments (Details)
₨ in Thousands, $ in Thousands
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Investment in debt securities - unquoted      
Investments in subsidiaries, joint ventures and associates ₨ 145,718 $ 2,240 ₨ 74,653
Vashi Railway Station Commercial Complex Limited [Member]      
Investment in equity instruments - unquoted      
Investment in equity shares 150   150
Sarayu Clean Gen Private Limited [Member]      
Investment in equity instruments - unquoted      
Investment in equity shares 1,560   1,560
Attala Systems Corporation [Member]      
Investment in debt securities - unquoted      
Investment in Attala Systems Corporation # [1] ₨ 144,008   ₨ 72,943
[1] Unsecured convertible promissory note of $2214 with Attala Systems Corporation, of which $ 750 (₹ 47,945), $ 375(₹ 23,973), $375 (₹ 23,973), $ 500 (₹ 31,964) and $ 214 (₹ 16,153) matures on 17th October 2019, 4th January 2020, 4th April 2020, 30th October 2020 and 1st January 2021 respectively. The note bears interest at a rate of five percent (5%). The promissory note is convertible to equity securities under specific terms based on triggering events as defined in the agreement.