CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Dec. 30, 2012	Jan. 01, 2012
Cash flows from operating activities:
Net income	$ 43,501	$ 91,105
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	21,071	24,514
Stock-based compensation	23,295	25,787
Deferred income taxes	(3,810)	(4,334)
Other non-cash items	3,138	5,082
Changes in operating assets and liabilities:
Accounts receivable	7,179	(12,244)
Inventories	(3,311)	(36)
Other assets	113	119
Accounts payable	(2,499)	(2,333)
Accrued compensation	(2,385)	2,382
Accrued taxes, net	14,367	4,531
Deferred revenue	(625)	(1,412)
Other liabilities	1,495	936
Net cash provided by operating activities	101,529	134,097
Cash flows from investing activities:
Purchases of available-for-sale securities	(228,202)	(336,005)
Proceeds from sales and maturities of available-for-sale securities	204,325	247,928
Purchases of property and equipment	(31,728)	(23,480)
Net cash used in investing activities	(55,605)	(111,557)
Cash flows from financing activities:
Proceeds from issuance of common stock under stock-based awards	6,571	12,674
Excess tax benefits from stock-based awards	129	529
Minimum tax withholding paid on behalf of employees for restricted stock units	(5,555)	(5,425)
Purchases of treasury stock	(111,729)	(103,900)
Net cash used in financing activities	(110,584)	(96,122)
Net decrease in cash and cash equivalents	(64,660)	(73,582)
Cash and cash equivalents at beginning of period	164,516	147,780
Cash and cash equivalents at end of period	$ 99,856	$ 74,198