Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 01, 2012	Apr. 03, 2011	Mar. 28, 2010
Cash flows from operating activities:
Net income	$ 229,436	$ 139,090	$ 54,948
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	27,626	29,777	31,803
Stock-based compensation	32,592	35,007	35,694
Amortization of acquisition-related intangible assets	4,015	4,623	8,331
Deferred income taxes	(4,813)	4,425	5,999
Gain on sale of business	(103,509)
Other non-cash items	5,946	1,341	(3,892)
Changes in operating assets and liabilities, net of acquisition and disposition:
Accounts receivable	(6,533)	3,113	(4,432)
Inventories	(843)	(7,528)	21,920
Other assets	361	770	487
Accounts payable	(4,908)	(3,192)	240
Accrued compensation	2,468	3,705	(6,036)
Accrued taxes	(16,265)	(15,522)	11,827
Deferred revenue	(2,345)	(1,041)	612
Other liabilities	2,935	(4,011)	4,271
Net cash provided by operating activities	166,163	190,557	161,772
Cash flows from investing activities:
Purchases of available-for-sale securities	(573,635)	(278,878)	(244,083)
Proceeds from sales and maturities of available-for-sale securities	433,644	203,160	223,729
Proceeds from disposition of trading securities		23,800	11,425
Distributions from other investment securities		329	5,464
Purchases of property and equipment	(32,731)	(23,260)	(24,528)
Proceeds from sale of business	124,969
Acquisition of business, net of cash acquired			(14,931)
Net cash used in investing activities	(47,753)	(74,849)	(42,924)
Cash flows from financing activities:
Proceeds from issuance of common stock under stock-based awards	29,961	36,090	34,375
Excess tax benefits from stock-based awards	708	1,674	591
Minimum tax withholding paid on behalf of employees for restricted stock units	(5,473)	(6,780)	(2,875)
Purchases of treasury stock	(126,870)	(189,220)	(163,419)
Payoff of line of credit assumed in acquisition			(934)
Net cash used in financing activities	(101,674)	(158,236)	(132,262)
Net increase (decrease) in cash and cash equivalents	16,736	(42,528)	(13,414)
Cash and cash equivalents at beginning of year	147,780	190,308	203,722
Cash and cash equivalents at end of year	164,516	147,780	190,308
Supplemental disclosure of cash flow information:
Cash paid during the year for income taxes	$ 25,311	$ 17,000	$ 36,937