Goodwill and Intangible Assets - Summary of Changes in Goodwill and Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Net balance - beginning of period	$ 336,602
Acquisition	0
Net balance - end of period	336,602
Finite-Lived Intangible Assets [Roll Forward]
Accumulated amortization	(1,579)	$ (3,300)
Net balance - end of period	61,252
Intangible Assets Disclosure [Roll Forward]
Net balance - beginning of period	212,324
Acquisition	428
Amortization of intangible assets	1,579	$ 3,300
Net balance - end of period	211,173
Trade Names
Indefinite-Lived Intangible Assets [Roll Forward]
Net balance - beginning of period	149,921
Acquisitions	0
Net balance - end of period	149,921
Developed Technologies
Finite-Lived Intangible Assets [Roll Forward]
Net balance - beginning of period	4,419
Acquisitions	0
Accumulated amortization	(51)
Net balance - end of period	4,368
Intangible Assets Disclosure [Roll Forward]
Amortization of intangible assets	51
Customer Relationships
Finite-Lived Intangible Assets [Roll Forward]
Net balance - beginning of period	52,114
Acquisitions	0
Accumulated amortization	(1,137)
Net balance - end of period	50,977
Intangible Assets Disclosure [Roll Forward]
Amortization of intangible assets	1,137
Domain Names
Finite-Lived Intangible Assets [Roll Forward]
Net balance - beginning of period	2,387
Acquisitions	0
Accumulated amortization	(159)
Net balance - end of period	2,228
Intangible Assets Disclosure [Roll Forward]
Amortization of intangible assets	159
Internally Developed Software
Finite-Lived Intangible Assets [Roll Forward]
Net balance - beginning of period	3,483
Acquisitions	428
Accumulated amortization	(232)
Net balance - end of period	3,679
Intangible Assets Disclosure [Roll Forward]
Amortization of intangible assets	$ 232