Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010
Condensed Consolidated Statements Of Income
Product sales	$ 106,116	$ 93,340	$ 292,844	$ 274,052
Rental revenue	30,035	17,986	78,964	49,544
Total revenue	136,151	111,326	371,808	323,596
Cost of products sold	50,032	46,760	141,096	136,697
Cost of rental revenue	6,974	4,483	18,854	11,945
Total cost of revenue	57,006	51,243	159,950	148,642
Gross profit	79,145	60,083	211,858	174,954
Expenses:
Selling and marketing	42,608	32,954	116,630	97,037
General and administrative	11,448	9,059	33,663	27,973
Research and development	11,676	11,570	33,613	34,225
Total expenses	65,732	53,583	183,906	159,235
Income from operations	13,413	6,500	27,952	15,719
Investment and other income (expense), net	222	122	939	348
Income before income taxes	13,635	6,622	28,891	16,067
Provision for income taxes	4,146	885	9,478	4,364
Net income	$ 9,489	$ 5,737	$ 19,413	$ 11,703
Basic earnings per common share	$ 0.43	$ 0.27	$ 0.89	$ 0.55
Weighted average common shares outstanding	21,963	21,445	21,765	21,343
Diluted earnings per common and common equivalent share	$ 0.42	$ 0.26	$ 0.87	$ 0.54
Weighted average common and common equivalent shares outstanding	22,703	21,859	22,350	21,675