Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 27, 2015	Sep. 28, 2014
Cash flows from operating activities:
Net income	$ 26,777	$ 49,141
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	27,336	26,398
Purchase premium amortization/discount accretion on investments, net	(73)	42
Non-cash stock-based compensation	12,517	15,226
Income tax impact associated with stock option exercises	(1,049)	(394)
Excess tax benefit from stock-based compensation	(252)	(340)
Deferred income taxes	(149)	(2,133)
Changes in assets and liabilities:
Accounts receivable	1,516	(12,084)
Inventories	52,870	17,963
Prepaid expenses and other assets	7,332	(9,846)
Accounts payable	(7,696)	(22,439)
Accrued employee compensation	(174)	4,021
Other accrued liabilities	(4,405)	(9,196)
Deferred revenue	(899)	9,221
Income taxes payable	2,002	1,974
Net Cash Provided by Operating Activities	115,653	67,554
Cash flows from investing activities:
Purchases of short-term investments	(50,301)	(105,076)
Proceeds from sales and maturities of short-term investments	105,142	109,669
Purchase of property and equipment	(11,142)	(13,421)
Payments made in connection with business acquisitions	0	1,050
Net Cash Provided by (Used in) Investing Activities	43,699	(9,878)
Cash flows from financing activities:
Purchase and retirement of common stock	(107,531)	(68,006)
Proceeds from exercise of stock options	6,137	6,039
Proceeds from issuance of common stock under employee stock purchase plan	2,985	2,762
Excess tax benefit from stock-based compensation	252	340
Net Cash Used in Financing Activities	(98,157)	(58,865)
Net increase (decrease) in cash and cash equivalents	61,195	(1,189)
Cash and cash equivalents, at beginning of period	141,234	143,009
Cash and cash equivalents, at end of period	$ 202,429	$ 141,820