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Activity in Options Outstanding under Employee Stock Option Scheme, Employees Stock Option Schemes (Detail) - Employees Stock Option Scheme - ₨ / shares	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Options
Options outstanding, beginning of period	75,443,800	92,156,300	128,654,300
Granted	19,895,000.0	16,882,050.0	0.0
Exercised	(23,772,304)	(32,544,550)	(34,359,200)
Forfeited	(3,205,385)	(986,800)	(1,992,500)
Lapsed	(54,700)	(63,200)	(146,300)
Options outstanding, end of period	68,306,411	75,443,800	92,156,300
Options exercisable, end of period	40,304,861	46,810,250	56,314,000
Weighted Average Exercise Price
Options outstanding, beginning of period	₨ 1,050.22	₨ 904.97	₨ 840.19
Granted	2,060.47	1,433.23	0.00
Exercised	925.79	837.59	658.20
Forfeited	1,518.42	1,055.59	981.44
Lapsed	837.10	963.45	857.61
Options outstanding, end of period	1,365.97	1,050.22	904.97
Options exercisable, end of period	1,017.78	901.44	835.06
Weighted average fair value of options granted during the year	₨ 525.57	₨ 464.17	₨ 0.00

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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