Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Operating activities:
Net income (loss)	$ 6,450	$ (339)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation of property, equipment and improvements	724	752
Amortization of identifiable intangible assets	468	770
Stock-based compensation	816	1,184
Excess tax benefits from stock-based compensation	(190)	0
Deferred income tax provision	1,300	412
Gain on sale of business	(2,912)	0
Bad debt/product return provision	168	30
Inventory obsolescence	409	230
Restructuring charge	651	0
Other	40	(6)
Changes in operating assets and liabilities	(4,369)	2,310
Net cash provided by operating activities	3,555	5,343
Investing activities:
Purchase of marketable securities	(8,079)	(12,135)
Proceeds from maturities of marketable securities	7,106	9,321
Proceeds from sale of business	2,866	0
Acquisition of business, net of cash acquired	2,860	0
Purchase of property, equipment, improvements and certain other intangible assets	(545)	(1,469)
Net cash used in investing activities	(1,512)	(4,283)
Financing activities:
Excess tax benefits from stock-based compensation	190	0
Proceeds from stock option plan transactions	5,752	9
Proceeds from employee stock purchase plan transactions	301	261
Purchases of common stock	(403)	(2,257)
Net cash provided by (used in) financing activities	5,840	(1,987)
Effect of exchange rate changes on cash and cash equivalents	(711)	(1,520)
Net increase (decrease) in cash and cash equivalents	7,172	(2,447)
Cash and cash equivalents, beginning of period	45,018	47,490
Cash and cash equivalents, end of period	52,190	45,043
Supplemental schedule of non-cash investing activities
Receivable related to sale of business	5,015	0
Liability related to acquisition of business	$ (10,550)	$ 0