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Stock-based compensation (Tables)

12 Months Ended

Mar. 31, 2016

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,
		2014		2015		2016
Dividend yield		0.81%-0.83%		0.82%		0.73%
Expected volatility		28.57%-41.52%		24.30%-32.00%		23.29%-26.46%
Risk-free interest rate		8.21%-9.08%		8.42%-8.63%		7.71%-8.07%
Expected term (in years)		3.81-5.44		4.13-5.45		4.21-5.66

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,
		2014				2015				2016
Options available to be granted, beginning of period*			58,080,400				112,121,300				72,847,350
Equity shares allocated for grant under the plan			100,000,000				—				—
Options granted			(47,060,000	)			(41,659,000	)			(44,836,200	)
Forfeited/lapsed*			1,100,900				2,385,050				3,523,700
Options available to be granted, end of period			112,121,300				72,847,350				31,534,850

* 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,
		2014								2015								2016
		Options				Weighted average exercise price				Options				Weighted average exercise price				Options				Weighted average exercise price
Options outstanding, beginning of period			65,443,045			Rs.	417.32				92,476,600			Rs.	556.06				109,033,000			Rs.	683.16
Granted			47,060,000				679.99				41,659,000				835.50				44,836,200				1,092.65
Exercised			*(18,903,115	)			382.63				(22,700,740	)			438.50				(21,691,200	)			563.78
Forfeited			(1,017,800	)			618.30				(2,296,500	)			761.32				(3,466,800	)			900.81
Lapsed			(105,530	)			247.18				(105,360	)			368.42				(56,900	)			546.78
Options outstanding, end of period			92,476,600			Rs.	556.06				109,033,000			Rs.	683.16				128,654,300			Rs.	840.19
Options exercisable, end of period			46,137,600			Rs.	431.59				41,871,400			Rs.	537.99				49,681,000			Rs.	661.84
Weighted average fair value of options granted during the year						Rs.	258.53							Rs.	302.31							Rs.	377.69

* As of March 31, 2014 excludes 728,290 options of equity shares allotted which were exercised in previous year.

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, 2016:

				As of March 31, 2016
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$ 10.26 to US$ 12.61)			5,740,800				3.34			Rs.	693.00
Plan D		Rs.680.00 (or US$ 10.26)			5,133,900				3.32				680.00
Plan E		Rs.440.16 to Rs.680.00 (or US$ 6.64 to US$ 10.26)			37,850,200				2.49				598.71
Plan F		Rs.835.50 to Rs. 1,097.80 (or US$ 12.61 to US$ 16.57)			79,929,400				4.80				975.41

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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