CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net income	$ 158,611	$ 220,704	$ 122,021
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	12,198	13,360	13,976
Stock-based compensation expense	7,275	8,478	12,167
Inventory impairments and abandonments	641	2,963	853
Deferred and other income tax expense	23,936	53,267	21,501
Loss (gain) on disposal of fixed assets	1,113	(332)	(392)
Change in allowance for doubtful accounts	0	(6)	(68)
Loss (gain) on extinguishment of debt, net	546	(309)	2,025
Changes in operating assets and liabilities:
Increase in accounts receivable	(9,708)	(10,199)	(5,800)
Decrease in income tax receivable	9,987	0	460
Increase in inventory	(14,749)	(231,445)	(147,511)
Increase in other assets	(2,784)	(2,761)	(2,384)
Increase in trade accounts payable	10,615	10,250	1,199
(Decrease) increase in other liabilities	(19,624)	17,104	13,609
Net cash provided by operating activities	178,057	81,074	31,656
Cash flows from investing activities:
Capital expenditures	(20,334)	(15,048)	(14,645)
Proceeds from sale of fixed assets	445	339	456
Purchases of investment securities	(9,779)	0	0
Other	(2)	0	0
Net cash used in investing activities	(29,670)	(14,709)	(14,189)
Cash flows from financing activities:
Repayment of debt	(8,998)	(73,900)	(82,476)
Repayment of borrowings from credit facility	0	(195,000)	0
Borrowings from credit facility	0	195,000	0
Debt issuance costs	(2,575)	0	(901)
Repurchase of common stock	0	(8,154)	0
Tax payments for stock-based compensation awards	(2,615)	(6,631)	(3,044)
Stock option exercises	262	5	569
Net cash used in financing activities	(13,926)	(88,680)	(85,852)
Net increase (decrease) in cash, cash equivalents, and restricted cash	134,461	(22,315)	(68,385)
Cash, cash equivalents, and restricted cash at beginning of period	251,828	274,143	342,528
Cash, cash equivalents, and restricted cash at end of period	$ 386,289	$ 251,828	$ 274,143