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FAIR VALUE DISCLOSURES - Schedule of the Carrying Amount, Fair Value, and Placement in the Fair Value Hierarchy (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Sep. 30, 2025
Fair Value, Inputs, Level 1 [Member]
Financial instruments - assets
Investment securities held to maturity
Loan receivable net allowance for credit losses
Financial instruments - liabilities
Certificates of deposit including retirement certificates
Borrowings
Fair Value, Inputs, Level 2 [Member]
Financial instruments - assets
Investment securities held to maturity	62,170	61,160
Loan receivable net allowance for credit losses
Financial instruments - liabilities
Certificates of deposit including retirement certificates	237,432	210,168
Borrowings	48,594	48,576
Fair Value, Inputs, Level 3 [Member]
Financial instruments - assets
Investment securities held to maturity
Loan receivable net allowance for credit losses	877,654	855,377
Financial instruments - liabilities
Certificates of deposit including retirement certificates
Borrowings
Carrying Value [Member]
Financial instruments - assets
Investment securities held to maturity	68,105	67,266
Loan receivable net allowance for credit losses	869,620	849,003
Financial instruments - liabilities
Certificates of deposit including retirement certificates	238,017	209,948
Borrowings	49,054	49,054
Fair Value [Member]
Financial instruments - assets
Investment securities held to maturity	62,170	61,160
Loan receivable net allowance for credit losses	877,654	855,377
Financial instruments - liabilities
Certificates of deposit including retirement certificates	237,432	210,168
Borrowings	$ 48,594	$ 48,576

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- Definition

Certificates of deposit including retirement certificates.

+ References

No definition available.

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- Definition

The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 860
-SubTopic 30
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480031/860-30-S50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(b))
-Publisher FASB
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Amount of debt and lease obligation, classified as current.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(20))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

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