Goodwill and Intangible Assets - Summary of Changes in Goodwill and Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
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	(2,122)	$ (1,600)
Net balance - end of period	53,710
Intangible Assets Disclosure [Roll Forward]
Net balance - beginning of period	205,391
Acquisition	362
Accumulated amortization	(2,122)	(1,600)
Net balance - end of period	203,631
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	3,964
Acquisitions	0
Accumulated amortization	(135)
Net balance - end of period	3,829
Intangible Assets Disclosure [Roll Forward]
Accumulated amortization	(135)
Customer Relationships
Finite-Lived Intangible Assets [Roll Forward]
Net balance - beginning of period	46,403
Acquisitions	0
Accumulated amortization	(1,525)
Net balance - end of period	44,878
Intangible Assets Disclosure [Roll Forward]
Accumulated amortization	(1,525)
Domain Names
Finite-Lived Intangible Assets [Roll Forward]
Net balance - beginning of period	1,750
Acquisitions	0
Accumulated amortization	(159)
Net balance - end of period	1,591
Intangible Assets Disclosure [Roll Forward]
Accumulated amortization	(159)
Internally Developed Software
Finite-Lived Intangible Assets [Roll Forward]
Net balance - beginning of period	3,353
Acquisitions	362
Accumulated amortization	(303)	(200)
Net balance - end of period	3,412
Intangible Assets Disclosure [Roll Forward]
Accumulated amortization	$ (303)	$ (200)