CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Class A Common Stock	Class B Common Stock	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid-in Capital	Retained Earnings	Non-controlling Interest	Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Sep. 30, 2024				14,687,000	1,430,000
Beginning balance at Sep. 30, 2024	$ 390,753			$ 147	$ 14	$ 202,921	$ 159,625	$ 29,943	$ (1,897)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(13,612)						(11,971)	(1,641)
Shares issued upon vesting of equity-based awards, net of tax withholding (in shares)				160,000
Shares issued upon vesting of equity-based awards, net of tax withholding	(1,823)			$ 1		(1,824)
Equity-based compensation	2,170					2,170
Currency translation adjustment	20							2	18
Tax expense (benefit)	(1,200)
Change in fair value of interest rate swaps, net of reclassification adjustment and tax expense	6,110							537	5,573
Ending balance (in shares) at Dec. 31, 2024				14,847,000	1,430,000
Ending balance at Dec. 31, 2024	383,618			$ 148	$ 14	203,267	147,654	28,841	3,694
Beginning balance (in shares) at Sep. 30, 2024				14,687,000	1,430,000
Beginning balance at Sep. 30, 2024	390,753			$ 147	$ 14	202,921	159,625	29,943	(1,897)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(13,987)
Ending balance (in shares) at Mar. 31, 2025				16,313,000	0
Ending balance at Mar. 31, 2025	381,615			$ 163	$ 0	232,981	147,286	0	1,185
Beginning balance (in shares) at Dec. 31, 2024				14,847,000	1,430,000
Beginning balance at Dec. 31, 2024	383,618			$ 148	$ 14	203,267	147,654	28,841	3,694
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(375)						(368)	(7)
Distributions to members	(186)							(186)
Exchange of B shares for A shares (in shares)				1,430,000	(1,430,000)
Exchange of B shares for A shares	0			$ 14	$ (14)	28,295		(28,598)	303
Establishment of liabilities under tax receivable agreement and related changes to deferred tax assets associated with increases in tax basis	(1,203)					(1,203)
Shares issued as part of employee stock purchase plan (in shares)				36,000
Shares issued as part of employee stock purchase plan	535			$ 1		534
Equity-based compensation	2,088					2,088
Currency translation adjustment	(21)								(21)
Tax expense (benefit)	900
Change in fair value of interest rate swaps, net of reclassification adjustment and tax expense	(2,841)							(50)	(2,791)
Ending balance (in shares) at Mar. 31, 2025				16,313,000	0
Ending balance at Mar. 31, 2025	381,615			$ 163	$ 0	232,981	147,286	0	1,185
Beginning balance (in shares) at Sep. 30, 2025		16,373,991	0	16,374,000	0
Beginning balance at Sep. 30, 2025	284,953			$ 164	$ 0	240,478	44,954	0	(643)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(7,711)						(7,711)
Exchange of B shares for A shares (in shares)		1,429,940	1,429,940
Shares issued upon vesting of equity-based awards, net of tax withholding (in shares)				192,000
Shares issued upon vesting of equity-based awards, net of tax withholding	(1,545)			$ 2		(1,547)
Equity-based compensation	2,136					2,136
Currency translation adjustment	0
Tax expense (benefit)	100
Change in fair value of interest rate swaps, net of reclassification adjustment and tax expense	(340)								(340)
Ending balance (in shares) at Dec. 31, 2025				16,566,000	0
Ending balance at Dec. 31, 2025	277,493			$ 166	$ 0	241,067	37,243	0	(983)
Beginning balance (in shares) at Sep. 30, 2025		16,373,991	0	16,374,000	0
Beginning balance at Sep. 30, 2025	284,953			$ 164	$ 0	240,478	44,954	0	(643)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(20,612)
Ending balance (in shares) at Mar. 31, 2026		16,617,541	0	16,618,000	0
Ending balance at Mar. 31, 2026	269,417			$ 166	$ 0	244,297	24,342	0	612
Beginning balance (in shares) at Dec. 31, 2025				16,566,000	0
Beginning balance at Dec. 31, 2025	277,493			$ 166	$ 0	241,067	37,243	0	(983)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(12,901)						(12,901)
Shares issued as part of employee stock purchase plan (in shares)				48,000
Shares issued as part of employee stock purchase plan	438					438
Shares issued upon vesting of equity-based awards, net of tax withholding (in shares)				4,000
Shares issued upon vesting of equity-based awards, net of tax withholding	(13)					(13)
Equity-based compensation	2,805					2,805
Currency translation adjustment	17								17
Tax expense (benefit)	(500)
Change in fair value of interest rate swaps, net of reclassification adjustment and tax expense	1,578								1,578
Ending balance (in shares) at Mar. 31, 2026		16,617,541	0	16,618,000	0
Ending balance at Mar. 31, 2026	$ 269,417			$ 166	$ 0	$ 244,297	$ 24,342	$ 0	$ 612