Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Operating activities
Net income	$ 28,093	$ 19,991	$ 20,978
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	10,409	12,120	11,255
Stock compensation expense	14,490	11,087	8,191
Inventory adjustment to net realizable value	539	163	1,048
Provision for doubtful accounts	356	839	1,390
Deferred tax expense	2,396	5,323	6,578
Impairment of long-lived and other non-current assets	459	0	0
(Gain) loss on disposal of property and equipment	36	(14)	(36)
Changes in operating assets and liabilities:
Accounts receivable	233	(4,269)	2,725
Inventory	5,241	4,949	(479)
Prepaid taxes and tax refund receivable	(239)	264	(152)
Prepaid expenses and other assets	1,452	(3,036)	(1,166)
Operating lease assets and liabilities	(345)	1,447	(228)
Accounts payable	(68)	8,374	(2,889)
Accrued expenses and other current liabilities	2,519	4,212	277
Deferred revenue	(204)	87	262
Payables to sellers	1,337	8,684	(581)
Other liabilities	54	0	(157)
Net cash provided by operating activities	66,758	70,221	47,016
Investing activities
Purchases of property and equipment, including capitalized software	(7,800)	(8,907)	(5,386)
Purchase of short-term investments	(19,020)	(2,264)	(8,037)
Maturities of short-term investments	10,142	8,161	1,923
Cash paid for business acquisition, net of cash acquired	(6,496)	(13,157)	0
Other investing activities, net	190	54	68
Net cash used in investing activities	(22,984)	(16,113)	(11,432)
Financing activities
Payments of the principal portion of finance lease liabilities	(102)	(89)	(101)
Proceeds from exercise of common stock options, net of tax	212	598	496
Taxes paid associated with net settlement of stock compensation awards	(5,743)	(2,254)	(1,262)
Common stock repurchases	(16,180)	(9,426)	(21,198)
Net cash used in financing activities	(21,813)	(11,171)	(22,065)
Effect of exchange rate differences on cash and cash equivalents	(580)	8	640
Net increase (decrease) in cash and cash equivalents	21,381	42,945	14,159
Cash and cash equivalents at beginning of year	153,226	110,281	96,122
Cash and cash equivalents at end of year	174,607	153,226	110,281
Supplemental disclosure of cash flow information
Cash paid for income taxes, net	9,201	1,710	1,590
Non-cash: Common stock surrendered in the exercise of stock options	47	397	200
Non-cash: Acquisition consideration paid in common stock	$ 945	$ 0	$ 0