Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating activities:
Net income	$ 5,778	$ 3,978
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation of property, equipment and improvements	3,211	3,472
Amortization of intangible assets	11,989	10,687
Stock-based compensation	6,331	5,323
Deferred income tax provision	1,995	744
Loss on sale of property and equipment	65	0
Change in fair value of contingent consideration	5,772	(128)
Provision for bad debt and product returns	1,520	438
Provision for inventory obsolescence	1,200	1,467
Restructuring charge	995	129
Other	84	(37)
Changes in operating assets and liabilities (net of acquisitions)	3,144	(6,920)
Net cash provided by (used in) operating activities	42,084	19,153
Investing activities:
Acquisition of business, net of cash acquired	(6,312)	(136,098)
Purchase of property, equipment, improvements and certain other intangible assets	(1,645)	(693)
Net cash used in investing activities	(7,957)	(136,791)
Financing activities:
Proceeds from long-term debt	618	119,018
Payments on long-term debt	(15,625)	(40,268)
Payments for contingent consideration	(4,200)	(4,698)
Proceeds from issuance of stock, net of offering expenses	73,830	0
Proceeds from stock option plan transactions	7,024	5,063
Proceeds from employee stock purchase plan transactions	917	798
Purchases of common stock	(1,985)	(1,692)
Net cash provided by financing activities	60,579	78,221
Effect of exchange rate changes on cash and cash equivalents	(1,893)	1,710
Net increase (decrease) in cash and cash equivalents	92,813	(37,707)
Cash and cash equivalents, beginning of period	54,129	92,792
Cash and cash equivalents, end of period	146,942	55,085
Supplemental schedule of non-cash investing and financing activities
Transfer of inventory to property, equipment and improvements	(1,624)	(1,202)
Contingent consideration recognized related to acquisition of business	(5,914)	(5,100)
Tenant improvement allowance	(1,000)	0
Accrual for purchase of property, equipment, improvements and certain other intangible assets	$ (14)	$ 0