Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Operating activities:
Net income	$ 1,751	$ 5,805	$ 7,615
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property, equipment and improvements	3,557	3,461	3,339
Amortization of identifiable intangible assets	3,589	4,416	4,476
Stock-based compensation	4,330	3,773	3,727
Excess tax benefits from stock-based compensation	(44)	(67)	(198)
Deferred income tax benefit	(2,783)	(2,055)	(2,452)
Bad debt/product return provision	98	811	500
Inventory obsolescence	860	1,258	1,413
Intangible impairment charge	0	361	0
Restructuring charges, net	81	313	1,259
Other	3	(85)	13
Changes in operating assets and liabilities (net of acquisition):
Accounts receivable	(2,730)	(2,368)	(343)
Inventories	(5,966)	(2,972)	(1,958)
Other assets	210	(212)	168
Income taxes	(1,408)	(2,634)	2,330
Accounts payable	970	1,413	(1,759)
Accrued expenses	(709)	530	(3,003)
Net cash provided by operating activities	1,809	11,748	15,127
Investing activities:
Purchase of marketable securities	(27,420)	(67,159)	(72,669)
Proceeds from maturities of marketable securities	47,420	63,089	65,533
Acquisition of businesses, net of cash acquired	0	(12,919)	0
Proceeds from sale of investment	0	136	135
Purchase of property, equipment, improvements and certain other intangible assets	(3,421)	(2,886)	(3,953)
Net cash provided by (used in) investing activities	16,579	(19,739)	(10,954)
Financing activities:
Excess tax benefits from stock-based compensation	44	67	198
Proceeds from stock option plan transactions	3,689	2,193	1,072
Proceeds from employee stock purchase plan transactions	1,009	1,008	1,041
Purchase of common stock	(15,702)	(14,058)	0
Net cash (used in) provided by financing activities	(10,960)	(10,790)	2,311
Effect of exchange rate changes on cash and cash equivalents	(1,258)	(145)	(922)
Net increase (decrease) in cash and cash equivalents	6,170	(18,926)	5,562
Cash and cash equivalents, beginning of period	41,320	60,246	54,684
Cash and cash equivalents, end of period	47,490	41,320	60,246
Supplemental disclosures of cash flow information:
Interest paid	5	42	23
Income taxes paid, net	3,197	6,300	3,201
Supplemental schedule of non-cash investing and financing activities:
Accrual for capitalized intangible asset	0	42	0
Issuance of common stock for business acquisition	0	6,741	0
Accrual for purchase of common stock	$ 100	$ 0	$ 0