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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

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