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Customer Accounts - Interest Expense on Customer Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Banking and Thrift, Interest [Abstract]
Checking accounts	$ 99,917	$ 70,396	$ 10,086
Savings accounts	3,952	1,715	1,377
Money market accounts	77,993	47,485	12,423
Time deposit accounts	351,654	119,255	19,422
Interest expense on customer accounts, gross	533,516	238,851	43,308
Less early withdrawal penalties	(1,082)	(1,618)	(267)
Interest expense on customer accounts, net	$ 532,434	$ 237,233	$ 43,041
Weighted average interest rate at end of year	3.09%	2.12%	0.51%
Daily weighted average interest rate during the year	3.26%	1.84%	0.34%

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Interest expense incurred on demand deposit accounts that represent borrowings rather than outstanding drafts.

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Aggregate amount of interest expense on all deposits.

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Early withdrawal penalties on domestic deposits which discourage customer withdrawal prior to maturity.

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The aggregate interest expense incurred on all domestic deposits.

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Interest expense incurred on all money market deposits.

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Interest expense incurred on all savings account deposits.

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The aggregate interest expense incurred on time deposits, including certificates of deposits, in domestic offices.

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