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Consolidated Statement of Cash Flows
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Mar. 31, 2016
INR (₨)
Cash flows from operating activities:        
Profit for the year ₨ 80,084 $ 1,230 ₨ 85,143 ₨ 89,567
Adjustments to reconcile profit for the year to net cash generated from operating activities:        
(Gain)/ loss on sale of property, plant and equipment and intangible assets, net (334) (5) 117 (55)
Depreciation, amortization and impairment 21,124 324 23,107 14,965
Unrealized exchange loss, net 4,794 74 3,945 2,664
Gain on sale of investments, net (5,978) (92) (3,486) (2,646)
Share based compensation expense 1,347 21 1,742 1,534
Share of profits/(loss) of equity accounted investee 11 [1]    
Income tax expense 22,390 344 25,213 25,366
Dividend and interest (income)/expenses, net (14,569) (224) (16,259) (19,599)
Gain from sale of EcoEnergy division     (4,082)  
Other non-cash items 4,405 68 (1,732)  
Changes in operating assets and liabilities; net of effects from acquisitions        
Trade receivables (9,735) (150) 3,346 (5,317)
Unbilled revenues 2,192 34 3,813 (5,329)
Inventories 545 8 1,475 (541)
Other assets (170) (3) 4,054 (766)
Trade payables, accrued expenses, other liabilities and provisions 4,499 69 (5,202) 4,683
Unearned revenues 1,733 27 (2,945) 1,282
Cash generated from operating activities before taxes 112,338 1,725 118,249 105,808
Income taxes paid, net (28,105) (432) (25,476) (26,935)
Net cash generated from operating activities 84,233 1,293 92,773 78,873
Cash flows from investing activities:        
Purchase of property, plant and equipment (21,870) (336) (20,853) (13,951)
Proceeds from sale of property, plant and equipment 1,171 18 1,207 779
Proceeds from sale of EcoEnergy division, net of related expenses     4,372  
Purchase of investments (782,475) (12,018) (813,439) (934,958)
Proceeds from sale of investments 830,448 12,755 729,755 830,647
Impact of investment hedging activities, net     (226) 266
Payment for business acquisitions including deposits and escrow, net of cash acquired (6,652) (102) (33,608) (39,373)
Interest received 14,347 220 17,069 18,368
Dividend received 609 9 311 66
Income taxes paid on sale of EcoEnergy division     (871)  
Net cash (used)/ generated in investing activities 35,578 546 (116,283) (138,156)
Cash flows from financing activities:        
Proceeds from issuance of equity shares/shares pending allotment 24 [1] [1] 4
Repayment of loans and borrowings (155,254) (2,384) (112,803) (137,298)
Proceeds from loans and borrowings 144,271 2,216 125,922 172,549
Payment for deferred contingent consideration in respect of business combination (164) (3) (138)  
Payment for buyback of shares including transaction cost (110,312) (1,694) (25,000)  
Interest paid on loans and borrowings (3,123) (48) (1,999) (1,348)
Payment of cash dividend (including dividend tax thereon) (5,420) (83) (8,734) (35,494)
Net cash used in financing activities (129,978) (1,996) (22,752) (1,587)
Net (decrease) in cash and cash equivalents during the year (10,167) (156) (46,262) (60,870)
Effect of exchange rate changes on cash and cash equivalents 375 6 (1,412) 549
Cash and cash equivalents at the beginning of the year 50,718 779 98,392 158,713
Cash and cash equivalents at the end of the year (Note 10) ₨ 40,926 $ 629 ₨ 50,718 ₨ 98,392
[1] Value is less than ₹1