Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jan. 02, 2016	Dec. 27, 2014
Income Statement [Abstract]
Net sales	$ 190,275	$ 200,615
Cost of sales	106,377	118,296
Gross profit	83,898	82,319
Operating expenses:
Research and development	19,140	19,173
Selling, general and administrative	36,774	38,141
Amortization of intangible assets	701	696
Total operating expenses	56,615	58,010
Income from operations	27,283	24,309
Other income (expense):
Interest income	240	96
Interest expense	(15)	(11)
Other - net	(447)	(770)
Total other income (expense), net	(222)	(685)
Income before income taxes	27,061	23,624
Provision for income taxes	6,775	6,194
Net income	$ 20,286	$ 17,430
Net income per share:
Basic (usd per share)	$ 0.85	$ 0.70
Diluted (usd per share)	$ 0.84	$ 0.69
Shares used in computation:
Basic (shares)	23,996	24,936
Diluted (shares)	24,236	25,197