CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jul. 01, 2012
Cash flows from operating activities:
Net income (loss)	$ (3,050)	$ 18,386
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	7,806	6,572
Stock-based compensation	8,171	9,277
Deferred income taxes	5,403	(2,254)
Impairment of property and equipment	2,429
Other non-cash items	345	809
Changes in operating assets and liabilities:
Accounts receivable	(3,169)	(2,224)
Inventories	3,052	(2,429)
Other assets	(210)	(2,240)
Accounts payable	(289)	661
Accrued compensation	(5,374)	(7,895)
Accrued taxes, net	(5,366)	3,108
Other liabilities	6,843	5,245
Net cash provided by operating activities	16,591	27,016
Cash flows from investing activities:
Purchases of available-for-sale securities	(89,318)	(72,440)
Proceeds from sales and maturities of available-for-sale securities	108,609	65,799
Purchases of property and equipment	(10,111)	(9,486)
Net cash provided by (used in) investing activities	9,180	(16,127)
Cash flows from financing activities:
Proceeds from issuance of common stock under stock-based awards	1,963	2,847
Excess tax benefits from stock-based awards	5	126
Minimum tax withholding paid on behalf of employees for restricted stock units	(4,280)	(5,349)
Purchases of treasury stock	(24,428)	(55,977)
Payments for credit facility commitment fee	(11)
Net cash used in financing activities	(26,751)	(58,353)
Net decrease in cash and cash equivalents	(980)	(47,464)
Cash and cash equivalents at beginning of period	95,532	164,516
Cash and cash equivalents at end of period	$ 94,552	$ 117,052