Goodwill and Intangible Assets - Summary of Changes in Goodwill and Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 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)	$ (3,300)	(3,656)	$ (6,600)
Net balance - end of period	59,368		59,368
Intangible Assets Disclosure [Roll Forward]
Net balance - beginning of period			212,324
Acquisition			621
Amortization of intangible assets	2,100	$ 3,300	3,656	$ 6,600
Net balance - end of period	209,289		209,289
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			(185)
Net balance - end of period	4,234		4,234
Intangible Assets Disclosure [Roll Forward]
Amortization of intangible assets			185
Customer Relationships
Finite-Lived Intangible Assets [Roll Forward]
Net balance - beginning of period			52,114
Acquisitions			0
Accumulated amortization			(2,662)
Net balance - end of period	49,452		49,452
Intangible Assets Disclosure [Roll Forward]
Amortization of intangible assets			2,662
Domain Names
Finite-Lived Intangible Assets [Roll Forward]
Net balance - beginning of period			2,387
Acquisitions			0
Accumulated amortization			(318)
Net balance - end of period	2,069		2,069
Intangible Assets Disclosure [Roll Forward]
Amortization of intangible assets			318
Internally Developed Software
Finite-Lived Intangible Assets [Roll Forward]
Net balance - beginning of period			3,483
Acquisitions			621
Accumulated amortization			(491)
Net balance - end of period	$ 3,613		3,613
Intangible Assets Disclosure [Roll Forward]
Amortization of intangible assets			$ 491