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Customer Accounts - Interest Expense on Customer Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Banking and Thrift, Interest [Abstract]
Checking accounts	$ 5,545	$ 8,447	$ 12,499
Savings accounts	1,143	959	980
Money market accounts	8,723	18,951	21,967
Time deposit accounts	27,100	72,494	87,665
Interest expense on customer accounts, gross	42,511	100,851	123,111
Less early withdrawal penalties	(198)	(539)	(895)
Interest expense on customer accounts, net	$ 42,313	$ 100,312	$ 122,216
Weighted average interest rate at end of year	0.23%	0.48%	1.08%
Daily weighted average interest rate during the year	0.35%	0.94%	1.05%

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The interest expense recognized during the period on customer deposits or security deposits held in interest bearing accounts.

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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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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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Weighted average interest rate calculated over time for domestic deposit liability.

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