Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014
Revenue:
Product	$ 124,436	$ 116,681	$ 248,917	$ 237,840
Service	19,519	20,662	37,622	37,913
Total revenue	143,955	137,343	286,539	275,753
Cost of sales:
Product	75,691	69,380	151,223	144,005
Service	11,722	12,429	21,943	21,675
Total cost of sales	87,413	81,809	173,166	165,680
Gross profit	56,542	55,534	113,373	110,073
Operating expenses:
Selling and marketing	20,304	22,411	41,558	43,894
General and administrative	12,794	13,978	26,996	27,184
Research and development	5,689	6,791	11,253	12,494
Total operating expenses	38,787	43,180	79,807	83,572
Income from operations	17,755	12,354	33,566	26,501
Interest expense, net	(273)	(205)	(440)	(365)
Other expense, net	(607)	(211)	(1,366)	(503)
Income before income taxes	16,875	11,938	31,760	25,633
Provision for income taxes	5,169	4,159	6,268	8,709
Net income	$ 11,706	$ 7,779	$ 25,492	$ 16,924
Basic-
Earnings per share (in dollars per share)	$ 0.78	$ 0.51	$ 1.69	$ 1.11
Weighted average number of common shares outstanding - basic (in shares)	14,986	15,245	15,047	15,299
Diluted-
Earnings per share (in dollars per share)	$ 0.77	$ 0.50	$ 1.68	$ 1.09
Weighted average number of common shares outstanding - diluted (in shares)	15,155	15,434	15,212	15,487
Dividends declared per share (in dollars per share)	$ 0.30	$ 0.30	$ 0.60	$ 0.60