CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Registered Shares	Additional Paid-in Capital	Treasury Shares	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance (in shares) at Mar. 31, 2014		173,106		10,206
Balance at Mar. 31, 2014	$ 804,128	$ 30,148	$ 0	$ (116,510)	$ 976,292	$ (85,802)
Increase (Decrease) in Shareholders' Equity
Total comprehensive income (loss)	20,777				19,676	1,101
Tax effects from share-based awards	861		861
Sales of shares upon exercise of options	574		(399)	$ 973
Sales of shares upon exercise of options and purchase rights (in shares)				(53)
Issuance of shares upon vesting of restricted stock units	(695)		(3,109)	$ 2,414
Issuance of shares upon vesting of restricted stock units (in shares)				(131)
Share-based compensation expense	7,063		7,063
Balance at Jun. 30, 2014	832,708	$ 30,148	4,416	$ (113,123)	995,968	(84,701)
Balance (in shares) at Jun. 30, 2014		173,106		10,022
Balance (in shares) at Mar. 31, 2015		173,106		8,625
Balance at Mar. 31, 2015	758,134	$ 30,148	0	$ (88,951)	930,174	(113,237)
Increase (Decrease) in Shareholders' Equity
Total comprehensive income (loss)	4,619				7,437	(2,818)
Tax effects from share-based awards	2,948		2,948
Sales of shares upon exercise of options	4,066		(1,651)	$ 5,717
Sales of shares upon exercise of options and purchase rights (in shares)				(369)
Issuance of shares upon vesting of restricted stock units	(1,296)		(3,754)	$ 2,458
Issuance of shares upon vesting of restricted stock units (in shares)				(157)
Share-based compensation expense	6,761		6,761
Purchases of treasury shares (in shares)				577
Purchases of treasury shares	8,814			$ 8,814
Balance at Jun. 30, 2015	$ 766,418	$ 30,148	$ 4,304	$ (89,590)	$ 937,611	$ (116,055)
Balance (in shares) at Jun. 30, 2015		173,106		8,676