Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Income Statement [Abstract]
Net Sales	$ 188,686	$ 172,712	$ 158,836
Cost of Sales	67,642	63,664	59,916
Cost of Sales-Plant consolidation			509
Gross Profit	121,044	109,048	98,411
Operating Expenses:
Research and development	10,787	10,275	9,822
Selling and marketing	22,424	22,092	21,885
General and administrative	30,519	26,372	24,883
Plant consolidation costs		1,013	548
Sales and marketing leadership reorganization			1,240
Total operating expenses	63,730	59,752	58,378
Operating Income	57,314	49,296	40,033
Other Income:
Interest income	44	42	115
Other, net	4	378	352
Total other income	48	420	467
Earnings Before Income Taxes	57,362	49,716	40,500
Income Tax Provision	19,330	16,345	13,669
Net Earnings	$ 38,032	$ 33,371	$ 26,831
Earnings Per Share Data:
Basic earnings per common share	$ 0.92	$ 0.81	$ 0.66
Diluted earnings per common share	$ 0.91	$ 0.80	$ 0.65
Common shares used for basic earnings per common share	41,226	41,080	40,715
Effect of dilutive stock options and restricted shares and units	669	528	643
Common shares used for diluted earnings per common share	41,895	41,608	41,358
Dividends declared per common share	$ 0.76	$ 0.76	$ 0.76
Anti-dilutive Securities:
Common share options and restricted shares and units	254	320	191