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Segment Information - Summary of Stock Compensation Expense of Segment (Detail) - INR (₨)
₨ in Millions
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Stock Compensation Expense arising from grant of options [line items]      
Total ₨ 1,347 ₨ 1,742 ₨ 1,534
Operating Segments [member] | Information Technology Services [member]      
Stock Compensation Expense arising from grant of options [line items]      
Total 1,402 1,550 1,424
Operating Segments [member] | Information Technology Products [member]      
Stock Compensation Expense arising from grant of options [line items]      
Total 3 4 2
Material Reconciling Items [member]      
Stock Compensation Expense arising from grant of options [line items]      
Total ₨ (58) ₨ 188 ₨ 108