STOCK-BASED COMPENSATION - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Stock Award Rollforward
Stock Awards outstanding at the beginning of the period (in shares)	9,191	7,820
Stock Awards granted (in shares)	6,742	5,886
Stock Awards vested (in shares)	(3,530)	(2,860)
Stock Awards canceled and forfeited (in shares)	(969)	(1,056)
Stock Awards outstanding at the end of the period (in shares)	11,434	9,790
Weighted-average fair value of grants during the period (in dollars per share)	$ 18.97	$ 22.35
Weighted-average remaining recognition period (in years)	1 year 10 months 17 days	2 years 1 month 17 days
Total unrecognized compensation expense at period-end	$ 157,416	$ 128,463
Stock Option Rollforward
Stock options outstanding at the beginning of the period (in shares)	2,274	3,114
Options exercised (in shares)	(175)	(391)
Options canceled and forfeited (in shares)	(28)	(55)
Stock options outstanding at the end of the period (in shares)	2,071	2,668
Total intrinsic value of options exercised during the period	$ 1,761	$ 4,844
Weighted-average remaining recognition period (in years)	1 year 3 months 29 days	2 years 1 month 28 days
Total unrecognized compensation expense at period-end	$ 558	$ 1,102

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Amount of cost to be recognized for option under share-based payment arrangement.

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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