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STOCK-BASED COMPENSATION AND STOCKHOLDERS' EQUITY - Stock Purchase Right and Restricted Stock Unit Activity (Details) - $ / shares shares in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Stock Purchase Right
Number of Shares
Beginning balance (in shares)	0	0	4,975
Vested and released (in shares)			(4,625)
Forfeited (in shares)			(350)
Ending balance (in shares)	0	0	0	4,975
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 0	$ 0	$ 8.10
Vested and released (in dollars per share)			7.88
Forfeited (in dollars per share)			7.88
Ending balance (in dollars per share)	$ 0	$ 0	$ 0	$ 8.10
Weighted Average Remaining Contractual Term (in Years)				1 year 1 month 2 days
Restricted stock units
Number of Shares
Beginning balance (in shares)	8,112	6,836	5,006
Granted (in shares)	6,256	5,592	5,061
Vested and released (in shares)	(4,579)	(2,771)	(1,899)
Forfeited (in shares)	(1,143)	(1,545)	(1,332)
Ending balance (in shares)	8,646	8,112	6,836	5,006
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 19.43	$ 17.45	$ 13.05
Granted (in dollars per share)	18.73	20.50	19.80
Vested and released (in dollars per share)	18.90	16.87	12.69
Forfeited (in dollars per share)	18.96	19.13	16.62
Ending balance (in dollars per share)	$ 19.27	$ 19.43	$ 17.45	$ 13.05
Weighted Average Remaining Contractual Term (in Years)	1 year 10 months 6 days	1 year 11 months 15 days	2 years 4 months 17 days
Performance Stock Units
Number of Shares
Beginning balance (in shares)	1,079	984	924
Granted (in shares)	1,013	293	474
Granted for performance achievement (in shares)	43	547	192
Vested and released (in shares)	(350)	(673)	(506)
Forfeited (in shares)	(209)	(72)	(100)
Ending balance (in shares)	1,576	1,079	984	924
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 22.05	$ 19.23	$ 15.95
Granted (in dollars per share)	29.00	21.40	19.52
Granted performance achievement (in dollars per share)	29.00	21.40	19.52
Vested and released (in dollars per share)	19.05	17.61	13.47
Forfeited (in dollars per share)	22.38	17.52	19.94
Ending balance (in dollars per share)	$ 27.33	$ 22.05	$ 19.23	$ 15.95
Weighted Average Remaining Contractual Term (in Years)	1 year 2 months 26 days	1 year 4 months 24 days	1 year 4 months 20 days

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted Performance Achievement in Period

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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