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Events after the reporting period - Additional Information (Detail)
₨ / shares in Units, $ in Millions
Apr. 16, 2019
INR (₨)
shares
Mar. 31, 2019
₨ / shares
Jun. 04, 2019
USD ($)
Disclosure of Events After Reporting Period [line items]      
Repurchase share percentage of paid-up capital   5.35%  
Shares repurchased offer price per share | ₨ / shares   ₨ 325  
Share repurchase program [member]      
Disclosure of Events After Reporting Period [line items]      
Shares authorised for repurchase | shares 323,076,923    
Share repurchase programmes maximum consideration amount | ₨ ₨ 105,000,000,000    
International TechneGroup [member]      
Disclosure of Events After Reporting Period [line items]      
Total amount of consideration for acquisition | $     $ 45