Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Operating activities:
Net income	$ 5,805	$ 7,615	$ 11,019
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property, equipment and improvements	3,461	3,339	3,006
Amortization of identifiable intangible assets	4,416	4,476	6,171
Stock-based compensation	3,773	3,727	3,444
Excess tax benefits from stock-based compensation	(67)	(198)	(796)
Deferred income tax benefit	(2,055)	(2,452)	(1,205)
Bad debt/product return provision	811	500	90
Inventory obsolescence	1,258	1,413	1,935
Intangible impairment charge	361	0	0
Restructuring charges, net	313	1,259	154
Other	(85)	13	263
Changes in operating assets and liabilities:
Accounts receivable	(2,368)	(343)	(2,756)
Inventories	(2,972)	(1,958)	623
Other assets	(212)	168	(602)
Income taxes	(2,634)	2,330	(432)
Accounts payable	1,413	(1,759)	(1,227)
Accrued expenses	530	(3,003)	2,152
Net cash provided by operating activities	11,748	15,127	21,839
Investing activities:
Purchase of marketable securities	(67,159)	(72,669)	(61,506)
Proceeds from maturities of marketable securities	63,089	65,533	44,843
Acquisition of businesses, net of cash acquired	(12,919)	0	(3,000)
Proceeds from sale of investment	136	135	0
Purchase of property, equipment, improvements and certain other intangible assets	(2,886)	(3,953)	(2,736)
Net cash used in investing activities	(19,739)	(10,954)	(22,399)
Financing activities:
Excess tax benefits from stock-based compensation	67	198	796
Proceeds from stock option plan transactions	2,193	1,072	2,853
Proceeds from employee stock purchase plan transactions	1,008	1,041	990
Purchase of common stock	(14,058)	0	0
Net cash (used in) provided by financing activities	(10,790)	2,311	4,639
Effect of exchange rate changes on cash and cash equivalents	(145)	(922)	(338)
Net (decrease) increase in cash and cash equivalents	(18,926)	5,562	3,741
Cash and cash equivalents, beginning of period	60,246	54,684	50,943
Cash and cash equivalents, end of period	41,320	60,246	54,684
Supplemental disclosures of cash flow information:
Interest paid	42	23	86
Income taxes paid, net	6,300	3,201	7,065
Supplemental schedule of non-cash investing activities:
Accrual for capitalized intangible asset	42	0	0
Issuance of common stock for business acquisition	$ 6,741	$ 0	$ 0