Goodwill and Intangible Assets - Summary of Changes in Goodwill and Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Goodwill [Roll Forward]
Net balance - beginning of period			$ 258,954
Net balance - end of period	$ 258,954		258,954
Intangible Asset, Indefinite-Lived [Roll Forward]
Disposals as part of sales during the nine months ended June 30, 2026			(1,100)
Impairment			(5,800)
Goodwill, Impairment Loss			0
Intangible Asset, Finite-Lived [Roll Forward]
Accumulated amortization	(600)	$ (2,100)	(1,677)	$ (6,400)
Net balance - end of period	2,824		2,824
Intangible Assets Disclosure [Roll Forward]
Net balance - beginning of period			130,198
Acquisition			311
Accumulated amortization	(600)	$ (2,100)	(1,677)	(6,400)
Net balance - end of period	121,932		121,932
Trade Names
Intangible Asset, Indefinite-Lived [Roll Forward]
Net balance - beginning of period			126,008
Disposals as part of sales during the nine months ended June 30, 2026			(1,100)
Net balance - end of period	119,108		119,108
Intangible Asset, Excluding Goodwill, Indefinite-Lived, Impairment Loss			(5,800)
Domain Names
Intangible Asset, Indefinite-Lived [Roll Forward]
Intangible Asset, Finite-Lived, Impairment Loss			0
Intangible Asset, Finite-Lived [Roll Forward]
Net balance - beginning of period			1,014
Accumulated amortization			(435)
Net balance - end of period	579		579
Intangible Assets Disclosure [Roll Forward]
Accumulated amortization			(435)
Internally Developed Software
Intangible Asset, Indefinite-Lived [Roll Forward]
Intangible Asset, Finite-Lived, Impairment Loss			0
Intangible Asset, Finite-Lived [Roll Forward]
Net balance - beginning of period			3,176
Acquisitions			311
Accumulated amortization	(400)		(1,242)	(1,000)
Net balance - end of period	2,245		2,245
Intangible Assets Disclosure [Roll Forward]
Accumulated amortization	$ (400)		$ (1,242)	$ (1,000)