Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Dec. 29, 2013	Dec. 30, 2012
Cash flows from operating activities:
Net income	$ 28,513	$ 43,501
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	23,620	21,071
Stock-based compensation	18,047	23,295
Deferred income taxes	(5,355)	(3,810)
Other non-cash items	5,706	3,138
Changes in operating assets and liabilities:
Accounts receivable	(5,088)	7,179
Inventories	6,116	(3,311)
Other assets	537	113
Accounts payable	(1,919)	(2,499)
Accrued compensation	(2,719)	(2,385)
Accrued taxes, net	7,734	14,367
Other liabilities	2,841	870
Net cash provided by operating activities	78,033	101,529
Cash flows from investing activities:
Purchases of available-for-sale securities	(259,008)	(228,202)
Proceeds from sales and maturities of available-for-sale securities	261,253	204,325
Purchases of property and equipment	(21,043)	(31,728)
Net cash used in investing activities	(18,798)	(55,605)
Cash flows from financing activities:
Proceeds from issuance of common stock under stock-based awards	6,756	6,571
Excess tax benefits from stock-based awards	46	129
Minimum tax withholding paid on behalf of employees for restricted stock units	(4,584)	(5,555)
Purchases of treasury stock	(47,785)	(111,729)
Payments for credit facility commitment fee	(202)
Net cash used in financing activities	(45,769)	(110,584)
Net increase (decrease) in cash and cash equivalents	13,466	(64,660)
Cash and cash equivalents at beginning of period	95,532	164,516
Cash and cash equivalents at end of period	$ 108,998	$ 99,856