Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Operating activities:
Net income	$ 7,615	$ 11,019	$ 8,941
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property, equipment and improvements	3,339	3,006	2,649
Amortization of identifiable intangible assets	4,476	6,171	7,484
Stock-based compensation	3,727	3,444	3,371
Excess tax benefits from stock-based compensation	(198)	(796)	(47)
Deferred income tax benefit	(2,452)	(1,205)	(3,656)
Bad debt/product return provision	500	90	175
Inventory obsolescence	1,413	1,935	848
Restructuring	1,259	154	(468)
Other	13	263	27
Changes in operating assets and liabilities:
Accounts receivable	(343)	(2,756)	(6,525)
Inventories	(1,958)	623	(891)
Other assets	168	(602)	749
Income taxes	2,330	(432)	(1,235)
Accounts payable	(1,759)	(1,227)	1,486
Accrued expenses	(3,003)	2,152	3,187
Net cash provided by operating activities	15,127	21,839	16,095
Investing activities:
Purchase of marketable securities	(72,669)	(61,506)	(38,538)
Proceeds from maturities of marketable securities	65,533	44,843	29,335
Acquisition of businesses, net of cash acquired, including deferred payments	0	(3,000)	(3,000)
Proceeds from sale of investment	135	0	0
Proceeds from sale of property and equipment	0	0	11
Purchase of property, equipment, improvements and certain other intangible assets	(3,953)	(2,736)	(2,975)
Net cash used in investing activities	(10,954)	(22,399)	(15,167)
Financing activities:
Payments on capital lease obligations	0	0	(9)
Excess tax benefits from stock-based compensation	198	796	47
Proceeds from stock option plan transactions	1,072	2,853	1,672
Proceeds from employee stock purchase plan transactions	1,041	990	894
Net cash provided by financing activities	2,311	4,639	2,604
Effect of exchange rate changes on cash and cash equivalents	(922)	(338)	(1,023)
Net increase in cash and cash equivalents	5,562	3,741	2,509
Cash and cash equivalents, beginning of period	54,684	50,943	48,434
Cash and cash equivalents, end of period	60,246	54,684	50,943
Supplemental Cash Flow Information:
Interest paid	23	86	159
Income taxes paid, net	$ 3,201	$ 7,065	$ 6,479