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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 29, 2014	Mar. 30, 2013	Mar. 29, 2014	Mar. 30, 2013
Income Statement [Abstract]
Net revenue	$ 114,206	$ 106,110	$ 193,319	$ 220,149
Cost of sales	56,534	57,290	97,282	119,804
Gross profit	57,672	48,820	96,037	100,345
Selling, general and administrative	28,235	28,423	51,337	57,490
Research and development	19,326	12,207	36,797	30,460
Operating expenses	47,561	40,630	88,134	87,950
Income from operations	10,111	8,190	7,903	12,395
Interest income	343	188	622	362
Interest expense	(297)	(1)	(416)	(1)
Income from operations before income taxes	10,157	8,377	8,109	12,756
Provision for income taxes	1,087	1,041	996	1,816
Net income	$ 9,070	$ 7,336	$ 7,113	$ 10,940
Net income per share:
Basic (in dollars per share)	$ 0.12	$ 0.10	$ 0.09	$ 0.15
Diluted (in dollars per share)	$ 0.12	$ 0.10	$ 0.09	$ 0.14
Weighted average shares outstanding:
Basic (in shares)	76,404	75,166	76,163	75,009
Diluted (in shares)	77,021	76,553	76,777	76,332

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