CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net income	$ 45,588	$ 140,175	$ 158,611
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	19,168	14,867	12,198
Stock-based compensation expense	7,338	7,391	7,275
Inventory impairments and abandonments	12,959	1,996	641
Model sale-leaseback revenue	(8,799)	0	0
Deferred and other income tax (benefit) expense	(4,738)	18,910	23,936
(Gain) loss on disposal of fixed assets	(301)	(426)	1,113
Gain on sale of investment	0	(8,591)	0
Loss on extinguishment of debt, net	0	437	546
Changes in operating assets and liabilities:
Increase in accounts receivable	(12,722)	(19,825)	(9,708)
Decrease in income tax receivable	0	0	9,987
Decrease (increase) in inventory	2,763	(282,061)	(14,749)
(Increase) decrease in other assets	(9,680)	341	(2,784)
(Decrease) increase in trade accounts payable	(20,908)	10,133	10,615
Increase (decrease) in other liabilities	1,313	(20,892)	(19,624)
Net cash provided by (used in) operating activities	31,981	(137,545)	178,057
Cash flows from investing activities:
Capital expenditures	(28,501)	(22,353)	(20,334)
Proceeds from sale of fixed assets	317	428	445
Proceeds from maturities of investment securities	9,556	0	0
Purchases of investment securities	(1,031)	(8,087)	(9,779)
Other	0	0	(2)
Net cash used in investing activities	(19,659)	(30,012)	(29,670)
Cash flows from financing activities:
Repayment of debt	0	(202,195)	(8,998)
Proceeds from issuance of debt	0	250,000	0
Repayment of borrowings from credit facility	(450,000)	(280,000)	0
Borrowings from credit facility	450,000	280,000	0
Debt issuance costs	(230)	(5,653)	(2,575)
Repurchase of common stock	(33,077)	(12,928)	0
Tax payments for stock-based compensation awards	(3,161)	(5,366)	(2,615)
Stock option exercises	107	20	262
Net cash (used in) provided by financing activities	(36,361)	23,878	(13,926)
Net (decrease) increase in cash, cash equivalents, and restricted cash	(24,039)	(143,679)	134,461
Cash, cash equivalents, and restricted cash at beginning of period	242,610	386,289	251,828
Cash, cash equivalents, and restricted cash at end of period	$ 218,571	$ 242,610	$ 386,289