CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional paid-in Capital	Retained earnings	Retained earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated other comprehensive income (loss)	Treasury Stock
Balance, beginning of the period (in shares) at Mar. 31, 2018			136,079,676					(58,304,917)
Balance, beginning of the period at Mar. 31, 2018	$ 749,095	$ 12,727	$ 13,609	$ 1,235,679	$ 628,331	$ 12,727	$ 10,767	$ (1,139,291)
Increase (Decrease) in Stockholders' Equity
Employee stock awards, benefit plans and other issuances (in shares)			1,330,757					(1,202,243)
Employee stock awards, benefit plans and other issuances	(30,101)		$ 133	20,286				$ (50,520)
Non-cash stock-based compensation (in shares)			415,706
Non-cash stock-based compensation	88,483		$ 41	88,442
Non-cash stock-based compensation from discontinued operations	62,861			62,861
Restricted stock units vested (in shares)			4,039,749
Restricted stock units vested	0		$ 404	(404)
Warrant exercises (in shares)								3,488
Warrant exercises	0			(51)				$ 51
Tender offer (in shares)								(11,235,955)
Tender offer	(503,393)							$ (503,393)
Acquisition of treasury stock (in shares)								(2,428,265)
Acquisition of treasury stock	(74,421)							$ (74,421)
Other comprehensive income (loss):
Foreign currency translation	(2,966)						(2,966)
Net earnings (loss)	1,028,547				1,028,547
Balance, end of the period (in shares) at Mar. 31, 2019			141,865,888					(73,167,892)
Balance, end of the period at Mar. 31, 2019	1,330,832		$ 14,187	1,406,813	1,669,605		7,801	$ (1,767,574)
Increase (Decrease) in Stockholders' Equity
Employee stock awards, benefit plans and other issuances (in shares)			266,011					(537,694)
Employee stock awards, benefit plans and other issuances	(19,786)		$ 27	4,709				$ (24,522)
Non-cash stock-based compensation (in shares)			71,211
Non-cash stock-based compensation	65,219		$ 7	65,212
Restricted stock units vested (in shares)			1,342,337
Restricted stock units vested	0		$ 134	(134)
Liability-classified restricted stock units vested (in shares)			393,306
Liability-classified restricted stock units vested	17,704		$ 39	17,665
Acquisition-related replacement stock options	2,300			2,300
Acquisition of treasury stock (in shares)								(4,375,728)
Acquisition of treasury stock	(182,190)							$ (182,190)
Other comprehensive income (loss):
Foreign currency translation	(2,056)						(2,056)
Net earnings (loss)	(124,511)				(124,511)
Balance, end of the period (in shares) at Mar. 31, 2020			143,938,753					(78,081,314)
Balance, end of the period at Mar. 31, 2020	1,087,512		$ 14,394	1,496,565	1,545,094		5,745	$ (1,974,286)
Increase (Decrease) in Stockholders' Equity
Employee stock awards, benefit plans and other issuances (in shares)			583,476					(182,730)
Employee stock awards, benefit plans and other issuances	(1,182)		$ 58	8,680				$ (9,920)
Non-cash stock-based compensation (in shares)			21,736
Non-cash stock-based compensation	84,396		$ 2	84,394
Restricted stock units vested (in shares)			2,186,763
Restricted stock units vested	0		$ 219	(219)
Liability-classified restricted stock units vested (in shares)			1,084,237
Liability-classified restricted stock units vested	40,760		$ 108	40,652
Acquisition of treasury stock (in shares)								(1,321,666)
Acquisition of treasury stock	(42,312)							$ (42,312)
Other comprehensive income (loss):
Foreign currency translation	1,777						1,777
Net earnings (loss)	(90,268)				(90,268)
Balance, end of the period (in shares) at Mar. 31, 2021			147,814,965					(79,585,710)
Balance, end of the period at Mar. 31, 2021	$ 1,080,683		$ 14,781	$ 1,630,072	$ 1,454,826		$ 7,522	$ (2,026,518)