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Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 INR (₨) Vote ₨ / shares shares | Mar. 31, 2017 INR (₨) Vote shares | Mar. 12, 2018 ₨ / shares | Mar. 31, 2016 INR (₨) shares
Disclosure of classes of share capital [line items] |  |  |  |
Authorized share capital | ₨ | ₨ 11,265,000,000 |  |  |
Par value per share | ₨ / shares |  |  | ₨ 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 | ₨ | 767,000,000 | ₨ 80,000,000 |  | ₨ 0
Expected reduction in opening retained earnings on adoption of IFRS 15 | ₨ | ₨ 2,239,000,000 |  |  |
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 | 23,097,216 | 13,728,607 |  | 14,829,824
Ordinary Shares [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Authorized shares | shares | 5,500,000,000 |  |  |
Par value per share | ₨ / shares | ₨ 2 |  |  |
10.25% Redeemable Cumulative Preference Shares [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Authorized shares | shares | 25,000,000 |  |  |
Par value per share | ₨ / shares | ₨ 10 |  |  |
10% Optionally Convertible Cumulative Preference Shares [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Authorized shares | shares | 150,000 |  |  |
Par value per share | ₨ / shares | ₨ 100 |  |  |

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