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STOCKHOLDERS' EQUITY - Option Activity (Details) - $ / shares	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Number of Shares
Outstanding, beginning balance (in shares)	3,998,285	4,462,412	4,793,266
Granted (in shares)	236,799	609,135	407,392
Exercised (in shares)	(759,884)	(773,897)	(603,998)
Canceled/forfeited (in shares)	(361,129)	(299,365)	(134,248)
Outstanding, ending balance (in shares)	3,114,071	3,998,285	4,462,412
Vested and expected to vest, end of period (in shares)	3,114,071
Exercisable, end of period (in shares)	2,737,032
Weighted Average Exercise Price Per Share
Outstanding, beginning balance (in dollars per share)	$ 8.93	$ 7.52	$ 6.29
Granted (in dollars per share)	21.65	14.95	14.63
Exercised (in dollars per share)	7.70	3.95	2.34
Canceled/Forfeited (in dollars per share)	15.41	13.05	8.41
Outstanding, ending balance (in dollars per share)	9.45	$ 8.93	$ 7.52
Vested and expected to vest, ending balance (in dollars per share)	9.45
Exercisable, end of period (in dollars per share)	$ 8.33

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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For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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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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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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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