CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Sep. 30, 2022		41,351,000
Balance at beginning of period at Sep. 30, 2022	$ 1,249,787	$ 415	$ (2,580)	$ 500,117	$ 801,981	$ (50,146)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	689,899				689,899
Other comprehensive income	16,206					16,206
Stock-based compensation	21,101			21,101
Issuance of common stock, net of shares withheld for tax (in shares)		288,000
Issuance of common stock, net of shares withheld for tax	(14,432)	$ 3		(14,435)
Repurchase of common stock (in shares)		(4,322,000)
Repurchase of common stock	(494,442)	$ (43)			(494,399)
Retirement of Treasure Stock	0		2,580		(2,580)
Ending balance (in shares) at Sep. 30, 2023		37,317,000
Balance at end of period at Sep. 30, 2023	1,468,119	$ 375	0	506,783	994,901	(33,940)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	472,872				472,872
Other comprehensive income	14,846					14,846
Stock-based compensation	20,300			20,300
Issuance of common stock, net of shares withheld for tax (in shares)		486,000
Issuance of common stock, net of shares withheld for tax	(17,825)	$ 4		(17,829)
Repurchase of common stock (in shares)		(2,945,000)
Repurchase of common stock	(383,951)	$ (29)			(383,922)
Dividends Paid to Shareholders	$ (34,461)				(34,461)
Ending balance (in shares) at Sep. 30, 2024	34,859,033	34,858,000
Balance at end of period at Sep. 30, 2024	$ 1,539,900	$ 350	0	509,254	1,049,390	(19,094)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(15,175)				(15,175)
Other comprehensive income	1,106					1,106
Stock-based compensation	23,561			23,561
Issuance of common stock, net of shares withheld for tax (in shares)		129,000
Issuance of common stock, net of shares withheld for tax	(6,214)	$ 1		(6,215)
Repurchase of common stock (in shares)		(1,322,000)
Repurchase of common stock	(100,633)	$ (13)			(100,620)
Dividends Paid to Shareholders	$ (44,204)				(44,204)
Ending balance (in shares) at Sep. 30, 2025	33,665,258	33,665,000
Balance at end of period at Sep. 30, 2025	$ 1,398,341	$ 338	$ 0	$ 526,600	$ 889,391	$ (17,988)