Consolidated Statements of Cash Flows (USD $) In Thousands	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Operating activities:
Net income	$ 11,019	$ 8,941	$ 4,083
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property, equipment and improvements	3,006	2,649	2,581
Amortization of identifiable intangible assets	6,171	7,484	7,476
Bad debt/product return provision (benefit), net	90	175	(265)
Inventory obsolescence	1,935	848	881
Stock-based compensation	3,444	3,371	3,518
Excess tax benefits from stock-based compensation	(796)	(47)	(80)
Deferred income taxes, net	(1,205)	(3,656)	(2,714)
Restructuring	154	(468)
Other	263	27	(230)
Changes in operating assets and liabilities (net of acquisitions):
Accounts receivable	(2,756)	(6,525)	5,384
Inventories	623	(891)	2,695
Other assets	(602)	749	193
Income taxes receivable	(432)	(1,235)	(1,090)
Accounts payable	(1,227)	1,486	(4,561)
Accrued expenses	2,152	3,187	(2,185)
Net cash provided by operating activities	21,839	16,095	15,686
Investing activities:
Purchase of marketable securities	(61,506)	(38,538)	(30,489)
Proceeds from maturities of marketable securities	44,843	29,335	62,624
Acquisition of businesses, net of cash acquired, including deferred payments	(3,000)	(3,000)	(2,986)
Proceeds from sale of property and equipment		11	10
Purchase of property, equipment, improvements and certain other intangible assets	(2,736)	(2,975)	(3,873)
Net cash (used in) provided by investing activities	(22,399)	(15,167)	25,286
Financing activities:
Payments on capital lease obligations		(9)	(336)
Purchase of treasury stock			(6,576)
Excess tax benefits from stock-based compensation	796	47	80
Proceeds from stock option plan transactions	2,853	1,672	423
Proceeds from employee stock purchase plan transactions	990	894	982
Net cash provided by (used in) financing activities	4,639	2,604	(5,427)
Effect of exchange rates changes on cash and cash equivalents	(338)	(1,023)	(1,287)
Net increase in cash and cash equivalents	3,741	2,509	34,258
Cash and cash equivalents, beginning of period	50,943	48,434	14,176
Cash and cash equivalents, end of period	54,684	50,943	48,434
Supplemental Cash Flow Information:
Interest paid	86	159	54
Income taxes paid, net	$ 7,065	$ 6,479	$ 3,944