Condensed Consolidated Statements of Operations (unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2011	Jan. 01, 2011
Net sales	$ 190,767	$ 183,111
Cost of sales	110,408	100,717
Gross profit	80,359	82,394
Operating expenses:
Research and development	18,779	18,530
Selling, general and administrative	34,631	36,078
Amortization of intangible assets	1,636	2,095
Total operating expenses	55,046	56,703
Income from operations	25,313	25,691
Other income (expense):
Interest and dividend income	202	183
Interest expense	(2)	(15)
Other—net	318	1,586
Total other income (expense), net	518	1,754
Income before income taxes	25,831	27,445
Provision for income taxes	8,780	8,332
Net income	$ 17,051	$ 19,113
Net income per share:
Basic	$ 0.73	$ 0.77
Diluted	$ 0.71	$ 0.76
Shares used in computation:
Basic	23,462	24,688
Diluted	23,961	25,268