Consolidated Condensed Statements Of Cash Flows (USD $) In Thousands	6 Months Ended
	Sep. 24, 2011	Sep. 25, 2010
Cash flows from operating activities:
Net income	$ 20,425	$ 48,476
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,656	3,893
Stock compensation expense	5,958	4,381
Deferred income taxes	11,135	(2,229)
Loss (gain) on retirement or writeoff of long-lived assets	3	(28)
Impairment of non-marketable securities		500
Net change in operating assets and liabilities:
Accounts receivable, net	(5,800)	(24,488)
Inventories	(9,055)	(6,567)
Other assets	(4,159)	(1,224)
Accounts payable and other accrued liabilities	11,446	11,806
Deferred income	2,490	1,261
Income taxes payable	(36)	342
Net cash provided by operating activities	37,063	36,123
Cash flows from investing activities:
Additions to property, equipment and software	(18,404)	(16,058)
Investments in technology	(6,381)	(737)
Purchase of marketable securities	(70,497)	(103,020)
Proceeds from sale and maturity of marketable securities	133,763	65,912
Decrease in restricted investments	2,888	100
Decrease (increase) in deposits and other assets	(93)	38
Net cash provided by (used in) investing activities	41,276	(53,765)
Cash flows from financing activities:
Repurchase and retirement of common stock	(76,782)
Net proceeds from the issuance of common stock	672	21,370
Net cash provided by (used in) financing activities	(76,110)	21,370
Net increase in cash and cash equivalents	2,229	3,728
Cash and cash equivalents at beginning of period	37,039	16,109
Cash and cash equivalents at end of period	$ 39,268	$ 19,837