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Stock-based compensation (Tables)

12 Months Ended

Mar. 31, 2019

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,
		2017				2018		2019
Dividend yield			0.0			0.65%-0.66%		0.62%-0.65%
Expected volatility			0.0			19.94%-21.65%		14.53%-18.68%
Risk-free interest rate			0.0			6.73%-7.20%		7.23%-8.31%
Expected term (in years)			0.0			4.66-6.06		2.78-5.16

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 year ending March 31,
		2017				2018				2019
Options available to be granted, beginning of period			31,534,850				133,673,650				117,841,600
Equity shares allocated for grant under the plan			100,000,000				0.0				0.0
Options granted			0.0				(16,882,050	)			(19,895,000	)
Forfeited/lapsed			2,138,800				1,050,000				3,260,085
Options available to be granted, end of period			133,673,650				117,841,600				101,206,685

Activity in the options outstanding under the Employee Stock Option Scheme is as follows:

		Years ended March 31,
		2017								2018								2019
		Options				Weighted average exercise price				Options				Weighted average exercise price				Options				Weighted average exercise price
Options outstanding, beginning of period			128,654,300			Rs.	840.19				92,156,300			Rs.	904.97				75,443,800			Rs.	1,050.22
Granted			0.0				0.0				16,882,050				1,433.23				19,895,000				2,060.47
Exercised			(34,359,200	)			658.20				(32,544,550	)			837.59				(23,772,304	)			925.79
Forfeited			(1,992,500	)			981.44				(986,800	)			1,055.59				(3,205,385	)			1,518.42
Lapsed			(146,300	)			857.61				(63,200	)			963.45				(54,700	)			837.10
Options outstanding, end of period			92,156,300			Rs.	904.97				75,443,800			Rs.	1,050.22				68,306,411			Rs.	1,365.97
Options exercisable, end of period			56,314,000			Rs.	835.06				46,810,250			Rs.	901.44				40,304,861			Rs.	1,017.78
Weighted average fair value of options granted during the year						Rs.	0.0							Rs.	464.17							Rs.	525.57

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, 2019:

				As of March 31, 2019
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$ 9.83 to US$ 12.08)			1,537,400				0.87				685.70
Plan D		Rs.680.00 (or US$ 9.83)			659,900				0.97				680.00
Plan E		Rs.680.00 (or US$ 9.83)			2,498,700				0.96				680.00
Plan F		Rs.835.50 to Rs. 1,462.15 (or US$ 12.08 to US$ 21.14)			44,238,411				2.71				1,134.48
Plan G		Rs.2,006.05 to Rs. 2,090.45 (or US$ 29.01 to US$ 30.23)			19,372,000				3.57				2,060.45

X

- 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.

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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.

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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.

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