Consolidated Statements of Income (unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2011	Jan. 01, 2011
Revenue:
Product	$ 117,451	$ 89,901
Service	16,246	15,975
Total revenue	133,697	105,876
Cost of sales:
Product	66,872	50,899
Service	8,112	8,305
Total cost of sales	74,984	59,204
Gross profit	58,713	46,672
Operating expenses:
Selling and marketing	17,009	16,579
General and administrative	13,196	8,491
Research and development	4,959	3,128
Total operating expenses	35,164	28,198
Income from operations	23,549	18,474
Interest expense	(324)	(470)
Interest income	118	43
Other (expense) income, net	(23)	57
Income before income taxes	23,320	18,104
Provision for income taxes	7,781	4,815
Net income	$ 15,539	$ 13,289
Basic-
Earnings per share (in dollars per share)	$ 0.99	$ 0.87
Weighted average number of common shares outstanding - basic (in shares)	15,681	15,305
Diluted-
Earnings per share (in dollars per share)	$ 0.98	$ 0.86
Weighted average number of common shares outstanding - diluted (in shares)	15,832	15,526
Dividends declared per share (in dollars per share)	$ 0.25	$ 0.20