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, 2019		141,865,888				(73,167,892)
Balance, beginning 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)		119,186				(255,469)
Employee stock awards, benefit plans and other issuances	(11,813)	$ 12	2,082			$ (13,907)
Non-cash stock-based compensation (in shares)		58,195
Non-cash stock-based compensation	31,332	$ 6	31,326
Restricted stock units vested (in shares)		634,153
Restricted stock units vested		$ 63	(63)
Liability-classified restricted stock units vested (in shares)		418,850
Liability-classified restricted stock units vested	17,704	$ 42	17,662
Acquisition of treasury stock (in shares)						(2,134,930)
Acquisition of treasury stock	(100,473)					$ (100,473)
Acquisition-related replacement stock options	2,300		2,300
Other comprehensive income (loss):
Foreign currency translation	(1,182)				(1,182)
Net loss	(82,342)			(82,342)
Balance, end of the period (in shares) at Sep. 30, 2019		143,096,272				(75,558,291)
Balance, end of the period at Sep. 30, 2019	1,186,358	$ 14,310	1,460,120	1,587,263	6,619	$ (1,881,954)
Balance, beginning of the period (in shares) at Jun. 30, 2019		142,451,563				(73,801,287)
Balance, beginning of the period at Jun. 30, 2019	1,272,157	$ 14,245	1,422,879	1,627,465	7,334	$ (1,799,766)
Increase (Decrease) in Stockholders' Equity
Employee stock awards, benefit plans and other issuances (in shares)		72,505				(34,274)
Employee stock awards, benefit plans and other issuances	(780)	$ 8	1,026			$ (1,814)
Non-cash stock-based compensation (in shares)		6,833
Non-cash stock-based compensation	16,268	$ 1	16,267
Restricted stock units vested (in shares)		146,521
Restricted stock units vested		$ 14	(14)
Liability-classified restricted stock units vested (in shares)		418,850
Liability-classified restricted stock units vested	17,704	$ 42	17,662
Acquisition of treasury stock (in shares)						(1,722,730)
Acquisition of treasury stock	(80,374)					$ (80,374)
Acquisition-related replacement stock options	2,300		2,300
Other comprehensive income (loss):
Foreign currency translation	(715)				(715)
Net loss	(40,202)			(40,202)
Balance, end of the period (in shares) at Sep. 30, 2019		143,096,272				(75,558,291)
Balance, end of the period at Sep. 30, 2019	1,186,358	$ 14,310	1,460,120	1,587,263	6,619	$ (1,881,954)
Balance, beginning of the period (in shares) at Mar. 31, 2020		143,938,753				(78,081,314)
Balance, beginning 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)		194,816				(113,612)
Employee stock awards, benefit plans and other issuances	(2,194)	$ 19	3,542			$ (5,755)
Non-cash stock-based compensation (in shares)		13,551
Non-cash stock-based compensation	27,912	$ 1	27,911
Restricted stock units vested (in shares)		777,618
Restricted stock units vested		$ 78	(78)
Liability-classified restricted stock units vested (in shares)		780,400
Liability-classified restricted stock units vested	24,441	$ 78	24,363
Acquisition of treasury stock (in shares)						(1,321,666)
Acquisition of treasury stock	(42,312)					$ (42,312)
Other comprehensive income (loss):
Foreign currency translation	1,199				1,199
Net loss	(45,696)			(45,696)
Balance, end of the period (in shares) at Sep. 30, 2020		145,705,138				(79,516,592)
Balance, end of the period at Sep. 30, 2020	1,050,862	$ 14,570	1,552,303	1,499,398	6,944	$ (2,022,353)
Balance, beginning of the period (in shares) at Jun. 30, 2020		145,248,520				(79,443,337)
Balance, beginning of the period at Jun. 30, 2020	1,058,289	$ 14,525	1,532,481	1,523,366	6,342	$ (2,018,425)
Increase (Decrease) in Stockholders' Equity
Employee stock awards, benefit plans and other issuances (in shares)		127,026				(73,255)
Employee stock awards, benefit plans and other issuances	(1,504)	$ 12	2,412			$ (3,928)
Non-cash stock-based compensation (in shares)		5,606
Non-cash stock-based compensation	17,443		17,443
Restricted stock units vested (in shares)		323,986
Restricted stock units vested		$ 33	(33)
Other comprehensive income (loss):
Foreign currency translation	602				602
Net loss	(23,968)			(23,968)
Balance, end of the period (in shares) at Sep. 30, 2020		145,705,138				(79,516,592)
Balance, end of the period at Sep. 30, 2020	$ 1,050,862	$ 14,570	$ 1,552,303	$ 1,499,398	$ 6,944	$ (2,022,353)