Unaudited Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net income	$ 14,411	$ 15,343
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	8,743	4,942
Purchase premium amortization/discount accretion on investments, net	93	373
Non-cash stock-based compensation	5,130	3,590
Income tax benefit associated with stock option exercises	(314)	354
Excess tax benefit from stock-based compensation	(153)	(354)
Deferred income taxes	(671)	(1,015)
Changes in assets and liabilities, net of effect of acquisitions:
Accounts receivable	(24,854)	18,118
Inventories	22,826	16,348
Prepaid expenses and other assets	(7,179)	(671)
Accounts payable	(18,245)	(4,901)
Accrued employee compensation	1,983	(4,235)
Other accrued liabilities	(2,422)	(6,869)
Deferred revenue	5,637	1,317
Income taxes payable	569	2,737
Net cash provided by operating activities	5,554	45,077
Cash flows from investing activities:
Purchases of short-term investments	(59,958)	(20,022)
Proceeds from sales and maturities of short-term investments	54,500	104,154
Purchase of property and equipment	(3,085)	(2,761)
Net cash (used in) provided by investing activities	(8,543)	81,371
Cash flows from financing activities:
Purchase and retirement of treasury stock	(15,908)	(336)
Proceeds from exercise of stock options	4,063	2,547
Proceeds from issuance of common stock under employee stock purchase plan	1,328	1,053
Excess tax benefit from stock-based compensation	153	354
Net cash (used in) provided by financing activities	(10,364)	3,618
Net (decrease) increase in cash and cash equivalents	(13,353)	130,066
Cash and cash equivalents, at beginning of period	143,009	149,032
Cash and cash equivalents, at end of period	$ 129,656	$ 279,098