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COMMITMENTS AND CONTINGENCIES (Details) | Sep. 30, 2021 USD ($) commitment | Sep. 30, 2020 USD ($) commitment
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Commitments and Contingencies Disclosure [Abstract] |  |
Unfunded loan commitments | $ 1,220,000,000 | $ 1,220,000,000
Number of investment commitments | commitment | 0 | 0
Securities, buy (sell) obligations | $ 0 | $ 0

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- Definition Number of Investment Commitments + References No definition available. + Details
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Namespace Prefix: | cash_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Other Commitments, Securities, Buy (Sell) Obligations + References No definition available. + Details
Name: | cash_OtherCommitmentsSecuritiesBuySellObligations
Namespace Prefix: | cash_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 + Details
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