Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Sep. 28, 2014	Sep. 29, 2013
Cash flows from operating activities:
Net income	$ 17,010	$ 7,927
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	23,855	15,730
Stock-based compensation	10,275	12,989
Deferred income taxes	4,077	3,632
Asset impairments	1,011	2,429
Other non-cash items	810	1,698
Changes in operating assets and liabilities:
Accounts receivable	(20,287)	(1,818)
Inventories	(12,106)	2,797
Other assets	(840)	180
Accounts payable	6,162	(102)
Accrued compensation	(7,256)	(7,141)
Accrued taxes, net	(3,012)	(905)
Other liabilities	(7,930)	3,249
Net cash provided by operating activities	11,769	40,665
Cash flows from investing activities:
Purchases of available-for-sale securities	(84,318)	(162,673)
Proceeds from sales and maturities of available-for-sale securities	80,376	172,629
Purchases of property and equipment	(12,068)	(15,389)
Net cash used in investing activities	(16,010)	(5,433)
Cash flows from financing activities:
Proceeds from issuance of common stock under stock-based awards	3,536	4,565
Minimum tax withholding paid on behalf of employees for restricted stock units	(3,450)	(4,514)
Purchases of treasury stock		(44,212)
Other financing activities	(173)	(96)
Net cash used in financing activities	(87)	(44,257)
Net decrease in cash and cash equivalents	(4,328)	(9,025)
Cash and cash equivalents at beginning of period	91,258	95,532
Cash and cash equivalents at end of period	$ 86,930	$ 86,507