Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities:
Net income	$ 5,023	$ 12,864
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation of property, equipment and improvements	2,187	2,088
Amortization of identifiable intangible assets	1,842	1,474
Stock-based compensation	3,502	2,663
Excess tax benefits from stock-based compensation	(326)	(202)
Deferred income tax (benefit) provision	(648)	748
Gain on sale of business	0	(2,870)
Change in fair value of contingent consideration	(1,330)	187
Bad debt/product return provision	338	116
Inventory obsolescence	1,030	1,284
Restructuring charges	2,515	747
Other	138	89
Changes in operating assets and liabilities (net of acquisitions)	(14,729)	1,395
Net cash (used in) provided by operating activities	(458)	20,583
Investing activities:
Purchase of marketable securities	(33,469)	(56,256)
Proceeds from maturities and sales of marketable securities	76,149	46,664
Proceeds from sale of investment	0	13
Proceeds from sale of Etherios	3,000	2,849
Acquisition of businesses, net of cash acquired	(30,111)	(2,860)
Purchase of property, equipment, improvements and certain other identifiable intangible assets	(1,577)	(1,584)
Net cash provided by (used in) investing activities	13,992	(11,174)
Financing activities:
Acquisition earn-out payments	(518)	0
Excess tax benefits from stock-based compensation	326	202
Proceeds from stock option plan transactions	3,264	6,732
Proceeds from employee stock purchase plan transactions	686	688
Purchases of common stock	(922)	(546)
Net cash provided by financing activities	2,836	7,076
Effect of exchange rate changes on cash and cash equivalents	(45)	(431)
Net increase in cash and cash equivalents	16,325	16,054
Cash and cash equivalents, beginning of period	75,727	45,018
Cash and cash equivalents, end of period	92,052	61,072
Supplemental schedule of non-cash investing and financing activities
Receivable related to sale of Etherios	0	4,931
Liability related to acquisition of businesses	(1,310)	(10,550)
Accrual for purchase of property, equipment, improvements and certain other identifiable intangible assets	$ 0	$ (38)