Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating activities:
Net income	$ 12,864	$ 3,603
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property, equipment and improvements	2,088	2,170
Amortization of identifiable intangible assets	1,474	2,286
Stock-based compensation	2,663	3,262
Excess tax benefits from stock-based compensation	(202)	0
Deferred income tax provision	748	1,729
Gain on insurance settlement related to property and equipment	0	(1,375)
Gain on sale of business	(2,870)	0
Change in fair value of contingent consideration	187	0
Bad debt/product return provision	116	198
Inventory obsolescence	1,284	842
Restructuring charges, net	747	509
Other	89	(81)
Changes in operating assets and liabilities	1,395	(4,147)
Net cash provided by operating activities	20,583	8,996
Investing activities:
Purchase of marketable securities	(56,256)	(31,054)
Proceeds from maturities of marketable securities	46,664	28,494
Proceeds from sale of investment	13	0
Proceeds from sale of business	2,849	0
Acquisition of business, net of cash acquired	(2,860)	0
Proceeds from insurance settlement related to property and equipment	0	1,400
Proceeds from sale of property and equipment	0	45
Purchase of property, equipment, improvements and certain other intangible assets	(1,584)	(3,888)
Net cash used in investing activities	(11,174)	(5,003)
Financing activities:
Excess tax benefits from stock-based compensation	202	0
Proceeds from stock option plan transactions	6,732	6,332
Proceeds from employee stock purchase plan transactions	688	708
Purchases of common stock	(546)	(2,339)
Net cash provided by financing activities	7,076	4,701
Effect of exchange rate changes on cash and cash equivalents	(431)	(2,429)
Net increase in cash and cash equivalents	16,054	6,265
Cash and cash equivalents, beginning of period	45,018	47,490
Cash and cash equivalents, end of period	61,072	53,755
Supplemental schedule of non-cash investing and financing activities
Receivable related to sale of business	4,931	0
Liability related to acquisition of business	(10,550)	0
Accrual for purchase of property, equipment, improvements and certain other intangible assets	$ (38)	$ 0