CONSOLIDATED STATEMENT OF EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional paid-in Capital	Retained earnings	Accumulated other comprehensive income (loss)	Treasury Stock
Balance, beginning of the period (in shares) at Mar. 31, 2017		132,875,373				(54,582,392)
Balance, beginning of the period at Mar. 31, 2017	$ 738,980	$ 13,288	$ 1,154,429	$ 602,609	$ 7,999	$ (1,039,345)
Increase (Decrease) in Stockholders' Equity
Employee stock awards, benefit plans and other issuances (in shares)		1,054,754				(420,419)
Employee stock awards, benefit plans and other issuances	8,665	$ 105	19,622			$ (11,062)
Non-cash stock-based compensation (in shares)		628,208
Non-cash stock-based compensation	61,460	$ 63	61,397
Restricted stock units vested (in shares)		1,521,341
Restricted stock units vested	0	$ 153	(153)
Acquisition of treasury stock (in shares)						(3,302,106)
Acquisition of treasury stock	(88,884)					$ (88,884)
Other comprehensive income (loss):
Foreign currency translation	2,768				2,768
Net earnings (loss)	23,480			23,480
Balance, end of the period (in shares) at Mar. 31, 2018		136,079,676				(58,304,917)
Balance, end of the period at Mar. 31, 2018	749,095	$ 13,609	1,235,679	628,331	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
Restricted stock units vested (in shares)		4,039,749
Restricted stock units vested	0	$ 404	(404)
Acquisition of treasury stock (in shares)						(2,428,265)
Acquisition of treasury stock	(74,421)					$ (74,421)
Non-cash stock-based compensation from discontinued operations	62,861		62,861
Other comprehensive income (loss):
Foreign currency translation	(2,966)				(2,966)
Net earnings (loss)	1,028,547			1,028,547
Warrant exercises	0		(51)			$ 51
Warrant exercises (in shares)						3,488
Acquisition of treasury stock from tender offer (in shares)						11,235,955
Tender offer	(503,393)					$ (503,393)
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)
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)
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
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)