Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 26, 2011	Mar. 27, 2010
Cash flows from operating activities:
Net income	$ 87,983	$ 203,503	$ 38,398
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	9,972	8,145	7,888
Loss (gain) on retirement or write-off of long-lived assets	23	(24)	70
Amortization of lease settlement			(83)
Deferred income taxes	(10,154)	(120,045)	(11,932)
Gain on marketable securities			(500)
Stock compensation expense	12,178	8,141	5,318
Changes in operating assets and liabilities:
Accounts receivable, net	(5,055)	(15,135)	(13,149)
Inventories	(15,418)	(5,101)	(15,518)
Other assets	(9,783)	(1,158)	(937)
Accounts payable	10,469	7,299	10,454
Accrued salaries and benefits	1,232	2,440	3,530
Deferred revenues	384	356	3,062
Income taxes payable	(130)	(80)	116
Other accrued liabilities	1,494	(1,401)	(1,581)
Net cash provided by operating activities	83,195	86,940	25,136
Cash flows from investing activities:
Proceeds from sale of available for sale marketable securities	181,282	202,753	111,167
Purchases of available for sale marketable securities	(127,852)	(255,426)	(147,929)
Proceeds from sale of non-marketable securities			500
Purchases of property, plant and equipment	(35,948)	(20,060)	(3,654)
Investments in technology	(6,604)	(1,527)	(2,185)
Acquisition of business, net of cash acquired			(550)
Decrease (increase) in restricted investments	5,786	69	(100)
(Increase) decrease in deposits and other assets	1,773	(58)	190
Net cash provided by (used) in investing activities	18,437	(74,249)	(42,561)
Cash flows from financing activities:
Repurchase and retirement of common stock	(76,782)	(22,766)
Issuance of common stock, net of issuance costs	4,108	31,005	2,030
Net cash provided by (used in) financing activities	(72,674)	8,239	2,030
Net increase (decrease) in cash and cash equivalents	28,958	20,930	(15,395)
Cash and cash equivalents at beginning of year	37,039	16,109	31,504
Cash and cash equivalents at end of year	65,997	37,039	16,109
Supplemental disclosures of cash flow information
Interest expense
Income taxes	$ 2,268	$ 784	$ 90