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, 2022				14,212,000	1,430,000
Beginning balance at Sep. 30, 2022	$ 444,877			$ 142	$ 14	$ 180,296	$ 204,880	$ 59,552	$ (7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	11,428						8,900	2,528
Distributions to members	(319)						(10)	(309)
Shares issued upon vesting of equity-based awards, net of tax withholding (in shares)				86,000
Shares issued upon vesting of equity-based awards, net of tax withholding	(754)			$ 1		(755)
Equity-based compensation	2,572					2,572
Currency translation adjustment	11							1	10
Ending balance (in shares) at Dec. 31, 2022				14,298,000	1,430,000
Ending balance at Dec. 31, 2022	457,815			$ 143	$ 14	182,113	213,770	61,772	3
Beginning balance (in shares) at Sep. 30, 2022				14,212,000	1,430,000
Beginning balance at Sep. 30, 2022	444,877			$ 142	$ 14	180,296	204,880	59,552	(7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	71,755
Currency translation adjustment	15
Ending balance (in shares) at Jun. 30, 2023				14,318,000	1,430,000
Ending balance at Jun. 30, 2023	521,563			$ 143	$ 14	186,642	264,325	70,433	6
Beginning balance (in shares) at Dec. 31, 2022				14,298,000	1,430,000
Beginning balance at Dec. 31, 2022	457,815			$ 143	$ 14	182,113	213,770	61,772	3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	27,037						22,804	4,233
Distributions to members	(72)						(2)	(70)
Shares issued upon vesting of equity-based awards, net of tax withholding (in shares)				27,000
Shares issued as part of employee stock purchase plan (in shares)				44,000
Shares issued as part of employee stock purchase plan	1,063			$ 1		1,062
Treasury stock, shares, acquired (in shares)				(63,000)
Repurchase and retirement of treasury shares	(1,579)			$ (1)		(760)	(818)
Shares issued upon vesting of equity-based awards, net of tax withholding	(386)					(386)
Equity-based compensation	2,491					2,491
Currency translation adjustment	8							1	7
Ending balance (in shares) at Mar. 31, 2023				14,306,000	1,430,000
Ending balance at Mar. 31, 2023	486,377			$ 143	$ 14	184,520	235,754	65,936	10
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	33,290						28,570	4,720
Distributions to members	(222)						1	(223)
Shares issued upon vesting of equity-based awards, net of tax withholding (in shares)				12,000
Equity-based compensation	2,122					2,122
Currency translation adjustment	(4)								(4)
Ending balance (in shares) at Jun. 30, 2023				14,318,000	1,430,000
Ending balance at Jun. 30, 2023	521,563			$ 143	$ 14	186,642	264,325	70,433	6
Beginning balance (in shares) at Sep. 30, 2023		14,420,129	1,429,940	14,420,000	1,430,000
Beginning balance at Sep. 30, 2023	414,078			$ 144	$ 14	193,018	165,432	55,469	1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(7,970)						(7,170)	(800)
Distributions to members	(3,789)							(3,789)
Purchase of non-controlling interest	(18,840)					716		(19,556)
Shares issued upon vesting of equity-based awards, net of tax withholding (in shares)				124,000
Shares issued upon vesting of equity-based awards, net of tax withholding	(1,552)			$ 1		(1,553)
Equity-based compensation	2,392					2,392
Currency translation adjustment	(9)							(1)	(8)
Ending balance (in shares) at Dec. 31, 2023				14,544,000	1,430,000
Ending balance at Dec. 31, 2023	384,310			$ 145	$ 14	194,573	158,262	31,323	(7)
Beginning balance (in shares) at Sep. 30, 2023		14,420,129	1,429,940	14,420,000	1,430,000
Beginning balance at Sep. 30, 2023	414,078			$ 144	$ 14	193,018	165,432	55,469	1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	4,235
Currency translation adjustment	1
Ending balance (in shares) at Jun. 30, 2024		14,593,318	1,429,940	14,593,000	1,430,000
Ending balance at Jun. 30, 2024	400,349			$ 146	$ 14	199,506	168,973	31,708	2
Beginning balance (in shares) at Dec. 31, 2023				14,544,000	1,430,000
Beginning balance at Dec. 31, 2023	384,310			$ 145	$ 14	194,573	158,262	31,323	(7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(4,509)						(3,969)	(540)
Distributions to members	(11)						(3)	(8)
Shares issued upon vesting of equity-based awards, net of tax withholding (in shares)				24,000
Shares issued as part of employee stock purchase plan (in shares)				25,000
Shares issued as part of employee stock purchase plan	732			$ 1		731
Shares issued upon vesting of equity-based awards, net of tax withholding	(331)					(331)
Equity-based compensation	2,277					2,277
Currency translation adjustment	4								4
Ending balance (in shares) at Mar. 31, 2024				14,593,000	1,430,000
Ending balance at Mar. 31, 2024	382,472			$ 146	$ 14	197,250	154,290	30,775	(3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	16,714						14,683	2,031
Distributions to members	(1,099)							(1,099)
Equity-based compensation	2,256					2,256
Currency translation adjustment	6							1	5
Ending balance (in shares) at Jun. 30, 2024		14,593,318	1,429,940	14,593,000	1,430,000
Ending balance at Jun. 30, 2024	$ 400,349			$ 146	$ 14	$ 199,506	$ 168,973	$ 31,708	$ 2