Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Operating activities:
Net income	$ 6,588	$ 1,751	$ 5,805
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property, equipment and improvements	2,949	3,557	3,461
Amortization of identifiable intangible assets	2,910	3,589	4,416
Stock-based compensation	4,301	4,330	3,773
Excess tax benefits from stock-based compensation	0	(44)	(67)
Deferred income tax benefit	(769)	(2,783)	(2,055)
Gain on insurance settlement related to property and equipment	(1,375)	0	0
Bad debt/product return provision	357	98	811
Inventory obsolescence	1,284	860	1,258
Intangible impairment charge	0	0	361
Restructuring charges, net	509	81	313
Other	87	3	(85)
Changes in operating assets and liabilities (net of acquisition):
Accounts receivable	(1,794)	(2,730)	(2,368)
Inventories	(1,913)	(5,966)	(2,972)
Other assets	241	210	(212)
Income taxes	387	(1,408)	(2,634)
Accounts payable	(3,769)	970	1,413
Accrued expenses	4,081	(709)	530
Net cash provided by operating activities	14,074	1,809	11,748
Investing activities:
Purchase of marketable securities	(54,427)	(27,420)	(67,159)
Proceeds from maturities of marketable securities	38,028	47,420	63,089
Acquisition of businesses, net of cash acquired	0	0	(12,919)
Proceeds from insurance settlement related to property and equipment	1,400	0	0
Proceeds from sale of property and equipment	45	0	0
Proceeds from sale of investment	0	0	136
Purchase of property, equipment, improvements and certain other intangible assets	(4,500)	(3,421)	(2,886)
Net cash (used in) provided by in investing activities	(19,454)	16,579	(19,739)
Financing activities:
Excess tax benefits from stock-based compensation	0	44	67
Proceeds from stock option plan transactions	6,559	3,689	2,193
Proceeds from employee stock purchase plan transactions	925	1,009	1,008
Purchase of common stock	(2,339)	(15,702)	(14,058)
Net cash provided by (used in) financing activities	5,145	(10,960)	(10,790)
Effect of exchange rate changes on cash and cash equivalents	(2,237)	(1,258)	(145)
Net (decrease) increase in cash and cash equivalents	(2,472)	6,170	(18,926)
Cash and cash equivalents, beginning of period	47,490	41,320	60,246
Cash and cash equivalents, end of period	45,018	47,490	41,320
Supplemental disclosures of cash flow information:
Interest paid	4	5	42
Income taxes paid, net	1,296	3,197	6,300
Supplemental schedule of non-cash investing and financing activities:
Accrual for capitalized intangible asset	17	0	42
Issuance of common stock for business acquisition	0	0	6,741
Accrual for purchase of common stock	$ 0	$ 100	$ 0