Consolidated Statements of Income (unaudited) (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
Revenue:
Product	$ 116,681	$ 119,793	$ 237,840	$ 244,414
Service	20,662	17,124	37,913	35,171
Total revenue	137,343	136,917	275,753	279,585
Cost of sales:
Product	69,380	73,559	144,005	149,519
Service	12,429	9,453	21,675	19,559
Total cost of sales	81,809	83,012	165,680	169,078
Gross profit	55,534	53,905	110,073	110,507
Operating expenses:
Selling and marketing	22,411	19,519	43,894	38,698
General and administrative	13,978	13,175	27,184	25,489
Research and development	6,791	5,588	12,494	10,640
Total operating expenses	43,180	38,282	83,572	74,827
Income from operations	12,354	15,623	26,501	35,680
Interest expense, net	(205)	(150)	(365)	(144)
Other expense, net	(211)	(954)	(503)	(502)
Income before income taxes	11,938	14,519	25,633	35,034
Provision for income taxes	4,159	3,458	8,709	10,190
Net income	$ 7,779	$ 11,061	$ 16,924	$ 24,844
Basic-
Earnings per share (in dollars per share)	$ 0.51	$ 0.70	$ 1.11	$ 1.58
Weighted average number of common shares outstanding - basic (in shares)	15,245	15,723	15,299	15,696
Diluted-
Earnings per share (in dollars per share)	$ 0.50	$ 0.69	$ 1.09	$ 1.56
Weighted average number of common shares outstanding - diluted (in shares)	15,434	15,928	15,487	15,887
Dividends declared per share (in dollars per share)	$ 0.30	$ 0.30	$ 0.60	$ 0.60