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Stock-based compensation (Tables) | 12 Months Ended
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Mar. 31, 2018
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The fair value of options has been estimated on the dates of each grant using a binomial option pricing model with the following assumptions:
|  | Years ended March 31,
|  | 2016 |  | 2017 |  | 2018
Dividend yield |  | 0.73% |  | — |  | 0.65%-0.66%
Expected volatility |  | 23.29%-26.46% |  | — |  | 19.94%-21.65%
Risk-free interest rate |  | 7.71%-8.07% |  | — |  | 6.73%-7.20%
Expected term (in years) |  | 4.21-5.66 |  | — |  | 4.66-6.06
Schedule of Share-based Compensation, Stock Options, Activity | Activity in the options available to be granted under the Employee Stock Option Scheme is as follows:
|  | Number of options available to be granted years ending March 31, |
|  | 2016 |  |  | 2017 |  |  | 2018 |
Options available to be granted, beginning of period* |  |  | 72,847,350 |  |  |  | 31,534,850 |  |  |  | 133,673,650 |
Equity shares allocated for grant under the plan |  |  | — |  |  |  | 100,000,000 |  |  |  | — |
Options granted |  |  | (44,836,200 | ) |  |  | — |  |  |  | (16,882,050 | )
Forfeited/lapsed* |  |  | 3,523,700 |  |  |  | 2,138,800 |  |  |  | 1,050,000 |
Options available to be granted, end of period |  |  | 31,534,850 |  |  |  | 133,673,650 |  |  |  | 117,841,600 |
* | Does not include options exchanged on acquisition of CBoP since these options on forfeiture/ lapse are not available for re-issue.
Activity in the options outstanding under the Employee Stock Option Scheme is as follows:
|  | Years ended March 31, |
|  | 2016 |  |  | 2017 |  |  | 2018 |
|  | Options |  |  | Weighted average exercise price |  |  | Options |  |  | Weighted average exercise price |  |  | Options |  |  | Weighted average exercise price |
Options outstanding, beginning of period |  |  | 109,033,000 |  |  | Rs. | 683.16 |  |  |  | 128,654,300 |  |  | Rs. | 840.19 |  |  |  | 92,156,300 |  |  | Rs. | 904.97 |
Granted |  |  | 44,836,200 |  |  |  | 1,092.65 |  |  |  | — |  |  |  | — |  |  |  | 16,882,050 |  |  |  | 1,433.23 |
Exercised |  |  | (21,691,200 | ) |  |  | 563.78 |  |  |  | (34,359,200 | ) |  |  | 658.20 |  |  |  | (32,544,550 | ) |  |  | 837.59 |
Forfeited |  |  | (3,466,800 | ) |  |  | 900.81 |  |  |  | (1,992,500 | ) |  |  | 981.44 |  |  |  | (986,800 | ) |  |  | 1,055.59 |
Lapsed |  |  | (56,900 | ) |  |  | 546.78 |  |  |  | (146,300 | ) |  |  | 857.61 |  |  |  | (63,200 | ) |  |  | 963.45 |
Options outstanding, end of period |  |  | 128,654,300 |  |  | Rs. | 840.19 |  |  |  | 92,156,300 |  |  | Rs. | 904.97 |  |  |  | 75,443,800 |  |  | Rs. | 1,050.22 |
Options exercisable, end of period |  |  | 49,681,000 |  |  | Rs. | 661.84 |  |  |  | 56,314,000 |  |  | Rs. | 835.06 |  |  |  | 46,810,250 |  |  | Rs. | 901.44 |
Weighted average fair value of options granted during the year |  |  |  |  |  | Rs. | 377.69 |  |  |  |  |  |  | Rs. | — |  |  |  |  |  |  | Rs. | 464.17 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range | The following summarizes information about stock options outstanding as of March 31, 2018:
|  |  |  | As of March 31, 2018 |
Plan |  | Range of exercise price |  | Number of shares arising out of options |  |  | Weighted average remaining life (years) |  |  | Weighted average exercise price |
Plan C |  | Rs.680.00 to Rs.835.50 (or US$ 10.44 to US$ 12.83) |  |  | 3,261,500 |  |  |  | 1.32 |  |  |  | 685.72 |
Plan D |  | Rs.680.00 (or US$ 10.44) |  |  | 1,635,700 |  |  |  | 1.43 |  |  |  | 680.00 |
Plan E |  | Rs.680.00 (or US$ 10.44) |  |  | 6,224,900 |  |  |  | 1.51 |  |  |  | 680.00 |
Plan F |  | Rs.835.50 to Rs. 1,462.15 (or US$ 12.83 to US$ 22.46) |  |  | 64,321,700 |  |  |  | 3.59 |  |  |  | 1,113.95 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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