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Significant Accounting Policies - Additional Information (Detail) ₨ / shares in Units, $ in Millions |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 01, 2018 INR (₨) | Mar. 31, 2019 INR (₨) Vote ₨ / shares shares | Mar. 31, 2018 INR (₨) Vote ₨ / shares shares | Mar. 31, 2019 USD ($) shares | Mar. 08, 2019 ₨ / shares | Mar. 31, 2017 INR (₨) ₨ / shares shares
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Authorized share capital |  | ₨ 25,274,000,000 |  |  |  |
Par value per share | ₨ / shares |  |  | ₨ 2 |  | ₨ 2 | ₨ 2
Number of vote | Vote |  | 1 | 1 |  |  |
Undistributed earnings after taxes not freely available for distribution |  | ₨ 1,139,000,000 | ₨ 1,139,000,000 |  |  | ₨ 1,139,000,000
Capital redemption reserve |  | 0 | 767,000,000 |  |  | 80,000,000
Unbilled receivables |  | 22,880,000,000 | 42,486,000,000 | $ 331 |  |
Unearned revenue |  | 14,570,000,000 |  |  |  |
Unbilled revenue recognized On contract assets | ₨ 17,469,000,000 | 13,558,000,000 |  |  |  |
Transaction price allocated to remaining performance obligations |  | ₨ 373,879,000,000 |  |  |  |
Percentage of transaction price allocated to remaining performance obligation as revenues |  | 59.00% |  |  |  |
Explanation of when entity expects to recognise transaction price allocated to remaining performance obligations as revenue |  | approximately 59% is expected to be recognized as revenues within two years, and the remainder thereafter. |  |  |  |
Lease liabilities |  | ₨ 15,867,000,000 |  |  |  |
Right of use asset |  | 13,266,000,000 |  |  |  |
Increase (decrease) due to application of IFRS 15 [member] |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Expected reduction in opening retained earnings on adoption of IFRS 15 |  | (2,279,000,000) |  |  |  |
Non financial contract assets |  | 15,038,000,000 |  |  |  |
Unbilled receivables |  | 22,880,000,000 |  |  |  |
Special economic zone re-investment reserve [member] |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Undistributed earnings after taxes not freely available for distribution |  | ₨ 28,565,000,000 | ₨ 0 |  |  | ₨ 0
Bottom of range [member] |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Perentage of voting power of another entity |  | 20.00% |  |  |  |
Top of range [member] |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Perentage of voting power of another entity |  | 50.00% |  |  |  |
Treasury shares [member] |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Treasury shares held | shares |  | 27,353,853 | 23,097,216 | 27,353,853 |  | 13,728,607
Ordinary Shares [member] |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Authorized shares | shares |  | 12,504,500,000 |  | 12,504,500,000 |  |
Par value per share | ₨ / shares |  | ₨ 2 |  |  |  |
Preference Shares [member] |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Authorized shares | shares |  | 25,000,000 |  | 25,000,000 |  |
10% Optionally Convertible Cumulative Preference Shares [member] |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Authorized shares | shares |  | 150,000 |  | 150,000 |  |
Par value per share | ₨ / shares |  | ₨ 100 |  |  |  |

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