Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net income	$ 11,997	$ 2,746
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	3,122	3,427
Stock-based compensation expense	3,511	2,311
Inventory impairments and abandonments	465	0
Deferred and other income tax expense (benefit)	4,114	(228)
Gain on sale of fixed assets	(95)	(63)
Change in allowance for doubtful accounts	(10)	9
Equity in loss from unconsolidated entities	75	13
Changes in operating assets and liabilities:
Decrease in accounts receivable	1,228	6,947
Decrease in income tax receivable	49	303
Increase in inventory	(62,661)	(68,999)
Decrease in other assets	1,076	1,978
Decrease in trade accounts payable	(11,329)	(20,999)
Decrease in other liabilities	(26,120)	(11,975)
Net cash used in operating activities	(74,578)	(84,530)
Cash flows from investing activities:
Capital expenditures	(2,953)	(2,632)
Proceeds from sale of fixed assets	95	66
Return of capital from unconsolidated entities	0	19
Net cash used in investing activities	(2,858)	(2,547)
Cash flows from financing activities:
Repayment of debt	0	(1,150)
Repayment of borrowings from credit facility	0	(95,000)
Borrowings from credit facility	0	125,000
Debt issuance costs	(427)	0
Tax payments for stock-based compensation awards	(2,620)	(2,646)
Stock option exercises and other financing activities	3	(1,885)
Net cash (used in) provided by financing activities	(3,044)	24,319
Net decrease in cash, cash equivalents, and restricted cash	(80,480)	(62,758)
Cash, cash equivalents, and restricted cash at beginning of period	342,528	122,794
Cash, cash equivalents, and restricted cash at end of period	$ 262,048	$ 60,036