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Significant Accounting Policies - Additional Information (Detail) ₨ / shares in Units, ₨ in Millions, $ in Millions |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 01, 2019 INR (₨) | Mar. 31, 2020 INR (₨) Vote ₨ / shares shares | Mar. 31, 2019 INR (₨) ₨ / shares shares | Mar. 31, 2020 USD ($) shares | Mar. 08, 2019 ₨ / shares | Mar. 31, 2018 INR (₨) ₨ / shares shares | Jun. 15, 2017 ₨ / shares
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Authorized share capital |  | ₨ 25,274 |  |  |  |  |
Par value per share | ₨ / shares |  | ₨ 2 | ₨ 2 |  | ₨ 2 | ₨ 2 | ₨ 2
Number of vote | Vote |  | 1 |  |  |  |  |
Undistributed earnings after taxes not freely available for distribution- Capital Reserve |  | ₨ 1,139 | ₨ 1,139 |  |  | ₨ 1,139 |
Capital redemption reserve |  | 646 | 0 |  |  | 767 |
Lease liabilities | ₨ 15,379 | 19,198 |  |  |  |  |
Right of use asset | ₨ 13,630 | 16,748 |  | $ 222 |  |  |
Weighted average discount rate on lease liabilities | 5.70% |  |  |  |  |  |
Reclassified from Property Plant and Equipment to right-of-use assets | ₨ 1,243 |  |  |  |  |  |
Reclassification of finance lease to lease liabilities | 2,002 |  |  |  |  |  |
Finance lease liability current | 1,506 |  |  |  |  |  |
Finance lease liability noncurrent | 496 |  |  |  |  |  |
Reclassification of prepaid rent on leasehold land and other assets to right of use assets | 2,222 |  |  |  |  |  |
Depreciation expense from right-of-use assets |  | 5,911 |  |  |  |  |
Interest expenses on lease liabilities |  | 914 |  |  |  |  |
Expense relating to low value assets |  | 44 |  |  |  |  |
Expense relating to short value assets |  | 2,085 |  |  |  |  |
Leases not yet commenced |  | 1,399 |  |  |  |  |
IFRS Sixteen [Member] |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Increase decrease in retained earnings | 872 |  |  |  |  |  |
Net deferred tax assets | 138 |  |  |  |  |  |
Gross carrying amount [member] |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Right of use asset |  | 22,689 | 17,095 |  |  |  |
Reclassified from Property Plant and Equipment to right-of-use assets | 3,420 |  |  |  |  |  |
Accumulated depreciation and amortisation [member] |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Right of use asset |  | 5,941 |  |  |  |  |
Reclassified from Property Plant and Equipment to right-of-use assets | ₨ 2,177 |  |  |  |  |  |
Depreciation expense from right-of-use assets |  | 5,911 |  |  |  |  |
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 |  |  |  |
Special economic zone re-investment reserve [member] |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Undistributed earnings after taxes not freely available for distribution- Capital Reserve |  | ₨ 43,804 | ₨ 28,565 |  |  | ₨ 0 |
Bottom of range [member] |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Perentage of voting power of another entity |  | 20.00% |  |  |  |  |
Bottom of range [member] | IFRS Sixteen [Member] |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Term of lease not yet commenced |  | 2 years |  |  |  |  |
Top of range [member] |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Perentage of voting power of another entity |  | 50.00% |  |  |  |  |
Top of range [member] | IFRS Sixteen [Member] |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Term of lease not yet commenced |  | 8 years |  |  |  |  |
Treasury shares [member] |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Treasury shares held | shares |  | 22,746,081 | 27,353,853 | 22,746,081 |  | 23,097,216 |
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 |  |  |
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 |  | 150,000 |  |  |
Par value per share | ₨ / shares |  | ₨ 100 |  |  |  |  |

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