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Income Taxes - Movement in Deferred Tax Assets and Liabilities (Detail) - INR (₨) ₨ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Beginning balance | ₨ 2,187 | ₨ 3,849 | ₨ (3,516)
Credit/(charge) in the consolidated statement of income | (475) | (1,592) | 3,944
Credit/(charge) in other comprehensive income | 1,645 | (616) | 1,573
On account of business combination | (177) |  | (113)
Assets held for sale |  |  | 1,961
Other (if any) |  | 546 |
Ending balance | 3,180 | 2,187 | 3,849
Carry forward losses [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Beginning balance | 3,149 | 5,694 | 5,513
Credit/(charge) in the consolidated statement of income | (1,287) | (2,879) | 133
Credit/(charge) in other comprehensive income | 182 | 334 | 48
Ending balance | 2,044 | 3,149 | 5,694
Trade payables, accrued expenses and other liabilities [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Beginning balance | 3,713 | 3,107 | 3,151
Credit/(charge) in the consolidated statement of income | 1,033 | 295 | 243
Credit/(charge) in other comprehensive income | 248 | (22) | (246)
Assets held for sale |  |  | (41)
Other (if any) |  | 333 |
Ending balance | 4,994 | 3,713 | 3,107
Allowances for lifetime expected credit loss [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Beginning balance | 4,521 | 4,499 | 2,955
Credit/(charge) in the consolidated statement of income | (591) | 9 | 1,564
Credit/(charge) in other comprehensive income | (9) | 2 | 2
Assets held for sale |  |  | (22)
Other (if any) |  | 11 |
Ending balance | 3,921 | 4,521 | 4,499
Minimum alternate tax [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Beginning balance |  | 74 | 1,520
Credit/(charge) in the consolidated statement of income | 3,425 | (74) | (1,446)
Ending balance | 3,425 |  | 74
Property, plant and equipment [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Beginning balance | (1,840) | (2,166) | (4,153)
Credit/(charge) in the consolidated statement of income | 1,150 | 219 | 912
Credit/(charge) in other comprehensive income | 4 | (94) | (75)
Assets held for sale |  |  | 1,150
Other (if any) |  | 201 |
Ending balance | (686) | (1,840) | (2,166)
Amortizable goodwill [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Beginning balance | (1,899) | (1,810) | (4,057)
Credit/(charge) in the consolidated statement of income | (92) | 16 | 1,522
Credit/(charge) in other comprehensive income | (175) | (105) | (53)
Assets held for sale |  |  | 778
Ending balance | (2,166) | (1,899) | (1,810)
Intangible assets [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Beginning balance | (2,295) | (3,190) | (4,511)
Credit/(charge) in the consolidated statement of income | 1,021 | 1,076 | 1,546
Credit/(charge) in other comprehensive income | (90) | (181) | (112)
On account of business combination | (177) |  | (113)
Ending balance | (1,541) | (2,295) | (3,190)
Interest income and fair value movement of investments [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Beginning balance | (1,455) | (1,712) | (2,245)
Credit/(charge) in the consolidated statement of income | 599 | 186 | (112)
Credit/(charge) in other comprehensive income | 230 | 71 | 645
Ending balance | (626) | (1,455) | (1,712)
Cash flow hedges [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Beginning balance | (604) | 29 | (1,419)
Credit/(charge) in other comprehensive income | 1,165 | (633) | 1,448
Ending balance | 561 | (604) | 29
Contract liabilities [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Beginning balance | (289) | (273) | (183)
Credit/(charge) in the consolidated statement of income | 285 | (1) | (35)
Credit/(charge) in other comprehensive income | (7) | (15) | (9)
Assets held for sale |  |  | (46)
Ending balance | (11) | (289) | (273)
SEZ Re-investment Reserve [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Beginning balance | (1,132) |  |
Credit/(charge) in the consolidated statement of income | (5,482) | (1,132) |
Ending balance | (6,614) | (1,132) |
Others [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Beginning balance | 318 | (403) | (87)
Credit/(charge) in the consolidated statement of income | (536) | 693 | (383)
Credit/(charge) in other comprehensive income | 97 | 27 | (75)
Assets held for sale |  |  | 142
Other (if any) |  | 1 |
Ending balance | ₨ (121) | ₨ 318 | ₨ (403)

X
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