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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Goodwill [Roll Forward]
Net balance - beginning of period			$ 336,602
Acquisition			0
Net balance - end of period	$ 336,602		336,602
Finite-Lived Intangible Assets [Roll Forward]
Accumulated amortization	(2,100)	$ (3,400)	(5,743)	$ (10,000)
Net balance - end of period	57,420		57,420
Intangible Assets Disclosure [Roll Forward]
Net balance - beginning of period			212,324
Acquisition			760
Amortization of intangible assets	2,100	$ 3,400	5,743	$ 10,000
Net balance - end of period	207,341		207,341
Trade Names
Indefinite-Lived Intangible Assets [Roll Forward]
Net balance - beginning of period			149,921
Acquisitions			0
Net balance - end of period	149,921		149,921
Developed Technologies
Finite-Lived Intangible Assets [Roll Forward]
Net balance - beginning of period			4,419
Acquisitions			0
Accumulated amortization			(320)
Net balance - end of period	4,099		4,099
Intangible Assets Disclosure [Roll Forward]
Amortization of intangible assets			320
Customer Relationships
Finite-Lived Intangible Assets [Roll Forward]
Net balance - beginning of period			52,114
Acquisitions			0
Accumulated amortization			(4,186)
Net balance - end of period	47,928		47,928
Intangible Assets Disclosure [Roll Forward]
Amortization of intangible assets			4,186
Domain Names
Finite-Lived Intangible Assets [Roll Forward]
Net balance - beginning of period			2,387
Acquisitions			0
Accumulated amortization			(478)
Net balance - end of period	1,909		1,909
Intangible Assets Disclosure [Roll Forward]
Amortization of intangible assets			478
Internally Developed Software
Finite-Lived Intangible Assets [Roll Forward]
Net balance - beginning of period			3,483
Acquisitions			760
Accumulated amortization			(759)
Net balance - end of period	$ 3,484		3,484
Intangible Assets Disclosure [Roll Forward]
Amortization of intangible assets			$ 759