Consolidated Statements of Income (unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 30, 2013	Mar. 31, 2012	Mar. 30, 2013	Mar. 31, 2012
Revenue:
Product	$ 119,793	$ 112,788	$ 244,414	$ 230,239
Service	17,124	16,231	35,171	32,477
Total revenue	136,917	129,019	279,585	262,716
Cost of sales:
Product	73,559	64,648	149,519	131,520
Service	9,453	7,981	19,559	16,093
Total cost of sales	83,012	72,629	169,078	147,613
Gross profit	53,905	56,390	110,507	115,103
Operating expenses:
Selling and marketing	19,519	19,206	38,698	36,215
General and administrative	13,175	13,917	25,489	27,113
Research and development	5,588	6,068	10,640	11,027
Total operating expenses	38,282	39,191	74,827	74,355
Income from operations	15,623	17,199	35,680	40,748
Interest expense, net	(150)	(212)	(144)	(418)
Other expense, net	(954)	(399)	(502)	(422)
Income before income taxes	14,519	16,588	35,034	39,908
Provision for income taxes	3,458	5,431	10,190	13,212
Net income	$ 11,061	$ 11,157	$ 24,844	$ 26,696
Basic-
Earnings per share (in dollars per share)	$ 0.70	$ 0.70	$ 1.58	$ 1.69
Weighted average number of common shares outstanding - basic (in shares)	15,723	15,906	15,696	15,793
Diluted-
Earnings per share (in dollars per share)	$ 0.69	$ 0.69	$ 1.56	$ 1.67
Weighted average number of common shares outstanding - diluted (in shares)	15,928	16,106	15,887	15,969
Dividends declared per share (in dollars per share)	$ 0.30	$ 0.25	$ 0.60	$ 0.50