Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Operating activities:
Net income	$ 8,411	$ 9,958	$ 1,631
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation of property, equipment and improvements	4,545	4,578	3,349
Amortization of identifiable intangible assets	14,754	8,818	9,435
Stock-based compensation	7,237	5,655	4,854
Deferred income tax benefit	(3,357)	(799)	(376)
Gain on sale of property, equipment and improvements	0	(4,392)	(622)
Change in fair value of contingent consideration	(128)	1,190	1,377
Provision for bad debt and product returns	2,135	635	1,120
Provision for inventory obsolescence	2,630	1,874	2,056
Other, net	366	(156)	368
Changes in operating assets and liabilities (net of acquisitions):
Accounts receivable	5,539	(6,589)	(16,004)
Inventories	(11,133)	(1,062)	(11,344)
Other assets	(704)	(866)	(1,412)
Income taxes	(1,100)	(103)	697
Accounts payable	3,205	8,232	2,728
Accrued expenses	2,078	1,991	(635)
Net cash provided by (used in) operating activities	34,478	28,964	(2,778)
Investing activities:
Proceeds from maturities of marketable securities	0	4,750	32,032
Proceeds from sale of business	0	0	2,000
Acquisition of businesses, net of cash acquired	(136,098)	0	(56,258)
Proceeds from sale of property and equipment	0	10,096	731
Purchase of property, equipment, improvements and certain other intangible assets	(899)	(9,335)	(1,842)
Net cash (used in) provided by investing activities	(136,997)	5,511	(23,337)
Financing activities:
Proceeds from long-term debt	119,018	0	0
Payments on long-term debt	(55,893)	0	0
Acquisition earn-out payments	(4,698)	(3,748)	0
Proceeds from stock option plan transactions	5,902	4,874	5,460
Proceeds from employee stock purchase plan transactions	1,065	1,058	1,115
Taxes paid for net share settlement of share-based payment awards	(1,791)	(1,071)	(748)
Net cash provided by financing activities	63,603	1,113	5,827
Effect of exchange rate changes on cash and cash equivalents	253	(810)	80
Net (decrease) increase in cash and cash equivalents	(38,663)	34,778	(20,208)
Cash and cash equivalents, beginning of period	92,792	58,014	78,222
Cash and cash equivalents, end of period	54,129	92,792	58,014
Supplemental disclosures of cash flow information:
Interest paid	3,009	1	10
Income taxes paid, net	3,686	2,048	1,235
Supplemental schedule of non-cash investing and financing activities:
Accrual for property, equipment, improvements and certain other intangibles assets	(26)	0	(78)
Transfer of inventory to property, equipment and improvements	(1,363)	(1,064)	(2,159)
Liability related to acquisition of business	$ (5,100)	$ 0	$ (2,300)