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Customer Accounts - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Banking and Thrift, Interest [Abstract]
Uninsured deposits	$ 5,134,192	$ 4,124,355

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- References

No definition available.

+ Details

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- Definition

Amount of uninsured deposit liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1406
-Paragraph e
-Publisher SEC

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant