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STOCKHOLDERS' EQUITY: - Time-vesting restricted stock unit activity (Details) - Restricted stock units - Time Based Vesting - $ / shares	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Non-vested restricted stock unit activity
Outstanding at the beginning of the period (in shares)	3,351,638
Granted (in shares)	2,228,445	1,697,506	1,939,746
Vested (in shares)	(1,587,963)
Units vested under the Company's March 2021 acceleration plan (in shares)	(700,936)
Forfeited or cancelled (in shares)	(598,941)
Outstanding at the end of the period (in shares)	2,692,243	3,351,638
Non-vested restricted stock units, Weighted average fair value per share at grant date
Outstanding at the beginning of the period (in dollars per share)	$ 40.68
Granted (in dollars per share)	44.77
Vested (in dollars per share)	37.23
Units vested under the Company's March 2021 acceleration plan (in dollars per share)	40.37
Forfeited or cancelled (in dollars per share)	41.67
Outstanding at the end of the period (in dollars per share)	$ 45.96	$ 40.68
Weighted average remaining contractual term (in years)	2 years 9 months 3 days	2 years 6 months 3 days

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Vested Under An Acceleration Plan 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 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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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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