Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jan. 01, 2012	Dec. 26, 2010
Cash flows from operating activities:
Net income	$ 91,105	$ 105,774
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	21,047	22,612
Stock-based compensation	25,787	27,111
Amortization of acquisition-related intangible assets	3,467	3,467
Deferred income taxes	(4,334)	6,810
Net gains on investment securities	(729)	(2,021)
Other non-cash items	5,811	1,435
Changes in operating assets and liabilities:
Accounts receivable	(12,244)	(10,769)
Inventories	(36)	(6,454)
Other assets	119	841
Accounts payable	(2,333)	(6,232)
Accrued compensation	2,382	405
Accrued taxes	4,531	(21,068)
Deferred revenue	(1,412)	(685)
Other liabilities	936	(3,968)
Net cash provided by operating activities	134,097	117,258
Cash flows from investing activities:
Purchases of available-for-sale securities	(336,005)	(221,884)
Proceeds from sales and maturities of available-for-sale securities	247,928	146,840
Proceeds from disposition of trading securities		23,800
Distributions from other investment securities		329
Purchases of property and equipment	(23,480)	(17,881)
Net cash used in investing activities	(111,557)	(68,796)
Cash flows from financing activities:
Proceeds from issuance of common stock under stock-based awards	12,674	29,637
Excess tax benefits from stock-based awards	529	1,610
Minimum tax withholding paid on behalf of employees for restricted stock units	(5,425)	(6,739)
Purchases of treasury stock	(103,900)	(156,986)
Net cash used in financing activities	(96,122)	(132,478)
Net decrease in cash and cash equivalents	(73,582)	(84,016)
Cash and cash equivalents at beginning of period	147,780	190,308
Cash and cash equivalents at end of period	$ 74,198	$ 106,292