CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional paid-in Capital	Retained earnings	Accumulated other comprehensive income	Treasury Stock
Balances at the beginning of the period at Mar. 31, 2015	$ 703,257	$ 12,794	$ 1,034,526	$ 591,798	$ 9,413	$ (945,274)
Balances at the beginning of the period (in shares) at Mar. 31, 2015		127,938,797				(50,102,724)
Increase (Decrease) in Stockholders' Equity
Employee stock awards, benefit plans and other issuances	10,417	$ 134	15,627			$ (5,344)
Employee stock awards, benefit plans and other issuances (in shares)		1,338,663				(294,522)
Tax impact of stock options and restricted stock	(293)		(293)
Non-cash stock-based compensation from continuing operations	31,463	$ 6	31,457
Non-cash share-based compensation from continuing operations (in shares)		61,464
Non-cash stock-based compensation from discontinued operations	1,008		1,008
Restricted stock units vested	0	$ 105	(105)
Restricted stock units vested (in shares)		1,051,182
Acquisition of treasury stock	(52,764)					$ (52,764)
Acquisition of treasury stock (in shares)						(2,633,436)
Comprehensive income:
Foreign currency translation	(907)				(907)
Unrealized gain on interest rate swap	84				84
Net earnings	6,703			6,703
Balances at the end of the period at Mar. 31, 2016	698,968	$ 13,039	1,082,220	598,501	8,590	$ (1,003,382)
Balances at the end of the period (in shares) at Mar. 31, 2016		130,390,106				(53,030,682)
Increase (Decrease) in Stockholders' Equity
Employee stock awards, benefit plans and other issuances	15,709	$ 123	21,007			$ (5,421)
Employee stock awards, benefit plans and other issuances (in shares)		1,233,566				(236,870)
Tax impact of stock options and restricted stock	2,183		2,183
Restricted stock units vested	0	$ 102	(102)
Restricted stock units vested (in shares)		1,015,539
Acquisition of treasury stock	(30,542)					$ (30,542)
Acquisition of treasury stock (in shares)						(1,314,840)
Non-cash stock-based compensation	49,145	$ 24	49,121
Non-cash stock-based compensation (in shares)		236,162
Comprehensive income:
Foreign currency translation	(706)				(706)
Unrealized gain on interest rate swap	115				115
Net earnings	4,108			4,108
Balances at the end of the period at Mar. 31, 2017	738,980	$ 13,288	1,154,429	602,609	7,999	$ (1,039,345)
Balances at the end of the period (in shares) at Mar. 31, 2017		132,875,373				(54,582,392)
Increase (Decrease) in Stockholders' Equity
Employee stock awards, benefit plans and other issuances	8,665	$ 105	19,622			$ (11,062)
Employee stock awards, benefit plans and other issuances (in shares)		1,054,754				(420,419)
Restricted stock units vested	0	$ 153	(153)
Restricted stock units vested (in shares)		1,521,341
Acquisition of treasury stock	(88,884)					$ (88,884)
Acquisition of treasury stock (in shares)						(3,302,106)
Non-cash stock-based compensation	61,460	$ 63	61,397
Non-cash stock-based compensation (in shares)		628,208
Comprehensive income:
Foreign currency translation	2,768				2,768
Unrealized gain on interest rate swap	0
Net earnings	23,480
Balances at the end of the period at Mar. 31, 2018	$ 749,095	$ 13,609	$ 1,235,679	$ 628,331	$ 10,767	$ (1,139,291)
Balances at the end of the period (in shares) at Mar. 31, 2018		136,079,676				(58,304,917)