CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net income (loss)	$ 74,304	$ (227,518)	$ 104,237
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	48,967	51,766	52,277
Amortization of other intangible assets	17,771	23,571	27,198
Share-based compensation expense	25,546	25,198	31,529
Impairment of goodwill and other assets		216,688
Impairment of investments	624	3,600
Loss (gain) on disposal of property, plant and equipment	4,411	2,007	(6,533)
Gain on sales of securities		(831)	(6,109)
Excess tax benefits from share-based compensation	(2,246)	(26)	(37)
Deferred income taxes and other	(4,828)	(3,209)	(2,249)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(219)	45,273	29,279
Inventories	49,471	23,109	(33,277)
Other assets	(1,388)	5,381	(2,570)
Accounts payable	(21,322)	(33,406)	3,327
Accrued and other liabilities	14,330	(9,214)	5,462
Net cash provided by operating activities	205,421	122,389	202,534
Cash flows from investing activities:
Purchases of property, plant and equipment	(46,658)	(54,487)	(54,199)
Investment in privately held companies	(300)	(4,420)	0
Acquisitions, net of cash acquired	(650)		(18,814)
Proceeds from sales of available-for-sale securities		917	6,550
Proceeds from return of investment from strategic investments	261
Proceeds from sales of property and plant			8,967
Purchases of trading investments	(8,450)	(4,196)	(7,505)
Proceeds from sales of trading investments	8,994	4,463	7,399
Net cash used in investing activities	(46,803)	(57,723)	(57,602)
Cash flows from financing activities:
Payment of cash dividends	(36,123)	(133,462)
Purchases of treasury shares		(87,812)	(156,036)
Proceeds from sales of shares upon exercise of options and purchase rights	16,914	15,982	17,591
Tax withholdings related to net share settlements of restricted stock units	(5,718)	(2,375)	(966)
Excess tax benefits from share-based compensation	2,246	26	37
Net cash used in financing activities	(22,681)	(207,641)	(139,374)
Effect of exchange rate changes on cash and cash equivalents	(349)	(1,571)	(5,119)
Net increase (decrease) in cash and cash equivalents	135,588	(144,546)	439
Cash and cash equivalents at beginning of period	333,824	478,370	477,931
Cash and cash equivalents at end of period	469,412	333,824	478,370
Non-cash investing activities:
Property, plant and equipment purchased during the period and included in period end liability accounts	5,204	4,828	5,454
Supplemental cash flow information:
Interest paid	1,080	1,293	110
Income taxes paid, net	$ 9,189	$ 14,108	$ 14,422