Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 01, 2012	Jul. 03, 2011
Cash flows from operating activities:
Net income	$ 18,386	$ 32,426
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,572	8,131
Stock-based compensation	9,277	9,667
Deferred income taxes	(2,254)	3,124
Other non-cash items	809	821
Changes in operating assets and liabilities:
Accounts receivable	(2,224)	(9,101)
Inventories	(2,429)	916
Other assets	(2,240)	(1,854)
Accounts payable	661	539
Accrued compensation	(7,895)	(4,674)
Accrued taxes	3,108	(1,340)
Deferred revenue	(266)	(596)
Other liabilities	5,511	2,254
Net cash provided by operating activities	27,016	40,313
Cash flows from investing activities:
Purchases of available-for-sale securities	(72,440)	(133,619)
Proceeds from sales and maturities of available-for-sale securities	65,799	60,171
Purchases of property and equipment	(9,486)	(8,982)
Net cash used in investing activities	(16,127)	(82,430)
Cash flows from financing activities:
Proceeds from issuance of common stock under stock-based awards	2,847	7,553
Excess tax benefits from stock-based awards	126	538
Minimum tax withholding paid on behalf of employees for restricted stock units	(5,349)	(5,259)
Purchases of treasury stock	(55,977)	(18,693)
Net cash used in financing activities	(58,353)	(15,861)
Net decrease in cash and cash equivalents	(47,464)	(57,978)
Cash and cash equivalents at beginning of period	164,516	147,780
Cash and cash equivalents at end of period	$ 117,052	$ 89,802