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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Federal statutory rate effect of:	21.00%	21.00%	21.00%
U.S. State and local income taxes	1.40%	1.00%	1.00%
Foreign earnings and losses taxed at different rates	2.60%	1.10%	1.10%
Change in valuation allowance	0.00%	(0.40%)	0.90%
U.K. bank tax	0.002	0.003	0.026
U.S. permanent items	(0.004)	0.002	0.002
Non-deductible compensation	0.80%	2.00%	0.70%
Foreign permanent items	(1.40%)	0.40%	(2.80%)
U.S. bargain purchase gain	0.00%	(1.40%)	0.00%
GILTI	2.00%	2.00%	0.60%
Unrecognized tax benefits	0.10%	0.00%	0.00%
Effective rate	26.30%	26.20%	25.30%

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