CONDENSED CONSOLIDATED STATEMENT OF EQUITY - 6 months ended Sep. 30, 2017 - USD ($) $ in Thousands	Total	Common Stock	Additional paid-in Capital	Retained earnings	Accumulated other comprehensive income	Treasury Stock
Balances (in shares) at Mar. 31, 2017		132,875,373				(54,582,392)
Balances 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)		596,881				(306,841)
Employee stock awards, benefit plans and other issuances	3,695	$ 60	11,604			$ (7,969)
Non-cash stock-based compensation (in shares)		330,951
Non-cash stock-based compensation	30,796	$ 33	30,763
Restricted stock units vested (in shares)		975,014
Restricted stock units vested		$ 97	(97)
Acquisition of treasury stock (in shares)						(860,000)
Acquisition of treasury stock	(19,776)					$ (19,776)
Foreign currency translation	1,411				1,411
Net earnings (loss)	(4,636)			(4,636)
Balances (in shares) at Sep. 30, 2017		134,778,219				(55,749,233)
Balances at Sep. 30, 2017	753,096	$ 13,478	1,197,083	600,215	$ 9,410	$ (1,067,090)
Increase (Decrease) in Stockholders' Equity
Cumulative-effect adjustment from adoption of ASU 2016-09	$ 2,626		$ 384	$ 2,242