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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