Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Sep. 30, 2012	Oct. 02, 2011
Cash flows from operating activities:
Net income	$ 30,260	$ 61,080
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	13,524	16,359
Stock-based compensation	16,322	17,687
Deferred income taxes	(3,493)	509
Other non-cash items	2,094	1,524
Changes in operating assets and liabilities:
Accounts receivable	3,749	(16,625)
Inventories	(2,064)	3,423
Other assets	(2,223)	(652)
Accounts payable	2,222	2,137
Accrued compensation	(7,270)	(3,636)
Accrued taxes, net	12,908	156
Deferred revenue	(884)	(1,453)
Other liabilities	3,663	1,310
Net cash provided by operating activities	68,808	81,819
Cash flows from investing activities:
Purchases of available-for-sale securities	(137,446)	(242,274)
Proceeds from sales and maturities of available-for-sale securities	129,587	160,542
Purchases of property and equipment	(22,029)	(18,202)
Net cash used in investing activities	(29,888)	(99,934)
Cash flows from financing activities:
Proceeds from issuance of common stock under stock-based awards	4,894	9,959
Excess tax benefits from stock-based awards	128	539
Minimum tax withholding paid on behalf of employees for restricted stock units	(5,505)	(5,363)
Purchases of treasury stock	(99,488)	(60,146)
Net cash used in financing activities	(99,971)	(55,011)
Net decrease in cash and cash equivalents	(61,051)	(73,126)
Cash and cash equivalents at beginning of period	164,516	147,780
Cash and cash equivalents at end of period	$ 103,465	$ 74,654