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Consolidated Condensed Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Dec. 31, 2011
Dec. 25, 2010
Cash flows from operating activities:    
Net income $ 37,156 $ 73,097
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 7,262 5,935
Stock compensation expense 8,725 5,848
Deferred income taxes 20,064 (4,082)
Loss (gain) on retirement or writeoff of long-lived assets 10 (24)
Impairment of non-marketable securities   500
Net change in operating assets and liabilities:    
Accounts receivable, net (15,414) (13,303)
Inventories (17,582) (4,800)
Other assets (4,405) (899)
Accounts payable and other accrued liabilities 14,188 3,044
Deferred income 1,667 620
Income taxes payable 240 618
Net cash provided by operating activities 51,911 66,554
Cash flows from investing activities:    
Additions to property, equipment and software (25,667) (17,719)
Investments in technology (6,011) (1,210)
Purchase of marketable securities (122,506) (176,626)
Proceeds from sale and maturity of marketable securities 175,234 140,165
Decrease in restricted investments 2,888 100
Decrease (increase) in deposits and other assets 604 (77)
Net cash provided by (used in) investing activities 24,542 (55,367)
Cash flows from financing activities:    
Repurchase and retirement of common stock (76,782) (22,767)
Net proceeds from the issuance of common stock 1,300 23,962
Net cash provided by (used in) financing activities (75,482) 1,195
Net increase in cash and cash equivalents 971 12,382
Cash and cash equivalents at beginning of period 37,039 16,109
Cash and cash equivalents at end of period $ 38,010 $ 28,491