LOANS RECEIVABLE, NET AND RELATED ALLOWANCE FOR CREDIT LOSSES - Schedule of Loan Portfolio (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Jun. 30, 2025	Sep. 30, 2024
One-to-four family residential [Member]
One-to-four family residential
Term Loans Amortized Cost Basis by Origination Fiscal Year 2025/ 2024	$ 13,780	$ 32,624
Term Loans Amortized Cost Basis by Origination Fiscal Year 2024/ 2023	32,632	42,084
Term Loans Amortized Cost Basis by Origination Fiscal Year 2023/ 2022	38,548	31,805
Term Loans Amortized Cost Basis by Origination Fiscal Year 2022/ 2021	29,549	25,970
Term Loans Amortized Cost Basis by Origination Fiscal Year 2021/ 2020	24,064	29,998
Term Loans Amortized Cost Basis by Origination Fiscal Year Prior	106,662	83,378
Revolving Loans Amortized Cost Basis		342
Revolving Loans Converted to Term
Total	245,235	246,201
One-to-four family residential [Member] \| Revolving Credit Facility [Member]
One-to-four family residential
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Commercial real estate [Member]
One-to-four family residential
Term Loans Amortized Cost Basis by Origination Fiscal Year 2025/ 2024	87,742	88,597
Term Loans Amortized Cost Basis by Origination Fiscal Year 2024/ 2023	86,986	84,674
Term Loans Amortized Cost Basis by Origination Fiscal Year 2023/ 2022	80,720	66,412
Term Loans Amortized Cost Basis by Origination Fiscal Year 2022/ 2021	64,455	64,573
Term Loans Amortized Cost Basis by Origination Fiscal Year 2021/ 2020	55,285	29,568
Term Loans Amortized Cost Basis by Origination Fiscal Year Prior	144,688	122,845
Revolving Loans Amortized Cost Basis	4,114	3,718
Revolving Loans Converted to Term		932
Total	523,990	461,319
Commercial real estate [Member] \| Revolving Credit Facility [Member]
One-to-four family residential
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Construction and land [Member]
One-to-four family residential
Term Loans Amortized Cost Basis by Origination Fiscal Year 2025/ 2024	8,538	5,650
Term Loans Amortized Cost Basis by Origination Fiscal Year 2024/ 2023	11,260	10,061
Term Loans Amortized Cost Basis by Origination Fiscal Year 2023/ 2022	2,757
Term Loans Amortized Cost Basis by Origination Fiscal Year 2022/ 2021
Term Loans Amortized Cost Basis by Origination Fiscal Year 2021/ 2020		1,156
Term Loans Amortized Cost Basis by Origination Fiscal Year Prior	2,575	4,069
Revolving Loans Amortized Cost Basis	800	1,786
Revolving Loans Converted to Term
Total	25,930	22,722
Construction and land [Member] \| Revolving Credit Facility [Member]
One-to-four family residential
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Home equity loans and lines of credit [Member]
One-to-four family residential
Term Loans Amortized Cost Basis by Origination Fiscal Year 2025/ 2024	400	1,585
Term Loans Amortized Cost Basis by Origination Fiscal Year 2024/ 2023	1,226	1,561
Term Loans Amortized Cost Basis by Origination Fiscal Year 2023/ 2022	1,433	1,600
Term Loans Amortized Cost Basis by Origination Fiscal Year 2022/ 2021	1,542	309
Term Loans Amortized Cost Basis by Origination Fiscal Year 2021/ 2020	276	247
Term Loans Amortized Cost Basis by Origination Fiscal Year Prior	1,134	1,220
Revolving Loans Amortized Cost Basis	23,404	17,902
Revolving Loans Converted to Term		304
Total	29,415	24,728
Home equity loans and lines of credit [Member] \| Revolving Credit Facility [Member]
One-to-four family residential
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Commercial Business [Member]
One-to-four family residential
Term Loans Amortized Cost Basis by Origination Fiscal Year 2025/ 2024	319	2,062
Term Loans Amortized Cost Basis by Origination Fiscal Year 2024/ 2023	1,241	507
Term Loans Amortized Cost Basis by Origination Fiscal Year 2023/ 2022	476	2,517
Term Loans Amortized Cost Basis by Origination Fiscal Year 2022/ 2021	2,052	2,298
Term Loans Amortized Cost Basis by Origination Fiscal Year 2021/ 2020	1,068	802
Term Loans Amortized Cost Basis by Origination Fiscal Year Prior	2,384	2,565
Revolving Loans Amortized Cost Basis	11,595	13,072
Revolving Loans Converted to Term		188
Total	19,135	24,011
Commercial Business [Member] \| Revolving Credit Facility [Member]
One-to-four family residential
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Other [Member]
One-to-four family residential
Term Loans Amortized Cost Basis by Origination Fiscal Year 2025/ 2024	41	61
Term Loans Amortized Cost Basis by Origination Fiscal Year 2024/ 2023	19
Term Loans Amortized Cost Basis by Origination Fiscal Year 2023/ 2022		47
Term Loans Amortized Cost Basis by Origination Fiscal Year 2022/ 2021	30
Term Loans Amortized Cost Basis by Origination Fiscal Year 2021/ 2020		9
Term Loans Amortized Cost Basis by Origination Fiscal Year Prior	1,426	1,771
Revolving Loans Amortized Cost Basis	189	347
Revolving Loans Converted to Term
Total	1,705	2,235
Other [Member] \| Revolving Credit Facility [Member]
One-to-four family residential
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Current period gross charge-offs
Performing [Member] \| One-to-four family residential [Member]
One-to-four family residential
Term Loans Amortized Cost Basis by Origination Fiscal Year 2025/ 2024	13,780	32,624
Term Loans Amortized Cost Basis by Origination Fiscal Year 2024/ 2023	32,565	42,084
Term Loans Amortized Cost Basis by Origination Fiscal Year 2023/ 2022	37,983	31,711
Term Loans Amortized Cost Basis by Origination Fiscal Year 2022/ 2021	29,549	25,970
Term Loans Amortized Cost Basis by Origination Fiscal Year 2021/ 2020	24,064	29,976
Term Loans Amortized Cost Basis by Origination Fiscal Year Prior	106,662	83,378
Revolving Loans Amortized Cost Basis		342
Revolving Loans Converted to Term
Total	244,603	246,085
Performing [Member] \| Home equity loans and lines of credit [Member]
One-to-four family residential
Term Loans Amortized Cost Basis by Origination Fiscal Year 2025/ 2024	400	1,585
Term Loans Amortized Cost Basis by Origination Fiscal Year 2024/ 2023	1,226	1,561
Term Loans Amortized Cost Basis by Origination Fiscal Year 2023/ 2022	1,433	1,600
Term Loans Amortized Cost Basis by Origination Fiscal Year 2022/ 2021	1,542	309
Term Loans Amortized Cost Basis by Origination Fiscal Year 2021/ 2020	276	247
Term Loans Amortized Cost Basis by Origination Fiscal Year Prior	1,134	1,220
Revolving Loans Amortized Cost Basis	23,404	17,902
Revolving Loans Converted to Term		304
Total	29,415	24,728
Performing [Member] \| Other [Member]
One-to-four family residential
Term Loans Amortized Cost Basis by Origination Fiscal Year 2025/ 2024	41	61
Term Loans Amortized Cost Basis by Origination Fiscal Year 2024/ 2023	19
Term Loans Amortized Cost Basis by Origination Fiscal Year 2023/ 2022		47
Term Loans Amortized Cost Basis by Origination Fiscal Year 2022/ 2021	30
Term Loans Amortized Cost Basis by Origination Fiscal Year 2021/ 2020		9
Term Loans Amortized Cost Basis by Origination Fiscal Year Prior	1,426	1,771
Revolving Loans Amortized Cost Basis	189	347
Revolving Loans Converted to Term
Total	1,705	2,235
Non-performing [Member] \| One-to-four family residential [Member]
One-to-four family residential
Term Loans Amortized Cost Basis by Origination Fiscal Year 2025/ 2024
Term Loans Amortized Cost Basis by Origination Fiscal Year 2024/ 2023	67
Term Loans Amortized Cost Basis by Origination Fiscal Year 2023/ 2022	565	94
Term Loans Amortized Cost Basis by Origination Fiscal Year 2022/ 2021
Term Loans Amortized Cost Basis by Origination Fiscal Year 2021/ 2020		22
Term Loans Amortized Cost Basis by Origination Fiscal Year Prior
Revolving Loans Amortized Cost Basis
Revolving Loans Converted to Term
Total	632	116
Non-performing [Member] \| Home equity loans and lines of credit [Member]
One-to-four family residential
Term Loans Amortized Cost Basis by Origination Fiscal Year 2025/ 2024
Term Loans Amortized Cost Basis by Origination Fiscal Year 2024/ 2023
Term Loans Amortized Cost Basis by Origination Fiscal Year 2023/ 2022
Term Loans Amortized Cost Basis by Origination Fiscal Year 2022/ 2021
Term Loans Amortized Cost Basis by Origination Fiscal Year 2021/ 2020
Term Loans Amortized Cost Basis by Origination Fiscal Year Prior
Revolving Loans Amortized Cost Basis
Revolving Loans Converted to Term
Total
Non-performing [Member] \| Other [Member]
One-to-four family residential
Term Loans Amortized Cost Basis by Origination Fiscal Year 2025/ 2024
Term Loans Amortized Cost Basis by Origination Fiscal Year 2024/ 2023
Term Loans Amortized Cost Basis by Origination Fiscal Year 2023/ 2022
Term Loans Amortized Cost Basis by Origination Fiscal Year 2022/ 2021
Term Loans Amortized Cost Basis by Origination Fiscal Year 2021/ 2020
Term Loans Amortized Cost Basis by Origination Fiscal Year Prior
Revolving Loans Amortized Cost Basis
Revolving Loans Converted to Term
Total
Pass [Member] \| Commercial real estate [Member]
One-to-four family residential
Term Loans Amortized Cost Basis by Origination Fiscal Year 2025/ 2024	87,742	88,597
Term Loans Amortized Cost Basis by Origination Fiscal Year 2024/ 2023	86,986	84,674
Term Loans Amortized Cost Basis by Origination Fiscal Year 2023/ 2022	80,720	66,412
Term Loans Amortized Cost Basis by Origination Fiscal Year 2022/ 2021	64,455	64,573
Term Loans Amortized Cost Basis by Origination Fiscal Year 2021/ 2020	55,285	29,568
Term Loans Amortized Cost Basis by Origination Fiscal Year Prior	144,688	122,605
Revolving Loans Amortized Cost Basis	4,114	3,718
Revolving Loans Converted to Term		932
Total	523,990	461,079
Pass [Member] \| Construction and land [Member]
One-to-four family residential
Term Loans Amortized Cost Basis by Origination Fiscal Year 2025/ 2024	8,538	5,650
Term Loans Amortized Cost Basis by Origination Fiscal Year 2024/ 2023	11,260	10,061
Term Loans Amortized Cost Basis by Origination Fiscal Year 2023/ 2022	2,757
Term Loans Amortized Cost Basis by Origination Fiscal Year 2022/ 2021
Term Loans Amortized Cost Basis by Origination Fiscal Year 2021/ 2020		1,156
Term Loans Amortized Cost Basis by Origination Fiscal Year Prior	2,575	4,069
Revolving Loans Amortized Cost Basis	800	1,786
Revolving Loans Converted to Term
Total	25,930	22,722
Pass [Member] \| Commercial Business [Member]
One-to-four family residential
Term Loans Amortized Cost Basis by Origination Fiscal Year 2025/ 2024	319	2,062
Term Loans Amortized Cost Basis by Origination Fiscal Year 2024/ 2023	1,241	507
Term Loans Amortized Cost Basis by Origination Fiscal Year 2023/ 2022	476	2,517
Term Loans Amortized Cost Basis by Origination Fiscal Year 2022/ 2021	2,052	2,298
Term Loans Amortized Cost Basis by Origination Fiscal Year 2021/ 2020	1,068	802
Term Loans Amortized Cost Basis by Origination Fiscal Year Prior	2,384	2,565
Revolving Loans Amortized Cost Basis	11,595	13,072
Revolving Loans Converted to Term		188
Total	19,135	24,011
Special Mention [Member] \| Commercial real estate [Member]
One-to-four family residential
Term Loans Amortized Cost Basis by Origination Fiscal Year 2025/ 2024
Term Loans Amortized Cost Basis by Origination Fiscal Year 2024/ 2023
Term Loans Amortized Cost Basis by Origination Fiscal Year 2023/ 2022
Term Loans Amortized Cost Basis by Origination Fiscal Year 2022/ 2021
Term Loans Amortized Cost Basis by Origination Fiscal Year 2021/ 2020
Term Loans Amortized Cost Basis by Origination Fiscal Year Prior		124
Revolving Loans Amortized Cost Basis
Revolving Loans Converted to Term
Total		124
Special Mention [Member] \| Construction and land [Member]
One-to-four family residential
Term Loans Amortized Cost Basis by Origination Fiscal Year 2025/ 2024
Term Loans Amortized Cost Basis by Origination Fiscal Year 2024/ 2023
Term Loans Amortized Cost Basis by Origination Fiscal Year 2023/ 2022
Term Loans Amortized Cost Basis by Origination Fiscal Year 2022/ 2021
Term Loans Amortized Cost Basis by Origination Fiscal Year 2021/ 2020
Term Loans Amortized Cost Basis by Origination Fiscal Year Prior
Revolving Loans Amortized Cost Basis
Revolving Loans Converted to Term
Total
Special Mention [Member] \| Commercial Business [Member]
One-to-four family residential
Term Loans Amortized Cost Basis by Origination Fiscal Year 2025/ 2024
Term Loans Amortized Cost Basis by Origination Fiscal Year 2024/ 2023
Term Loans Amortized Cost Basis by Origination Fiscal Year 2023/ 2022
Term Loans Amortized Cost Basis by Origination Fiscal Year 2022/ 2021
Term Loans Amortized Cost Basis by Origination Fiscal Year 2021/ 2020
Term Loans Amortized Cost Basis by Origination Fiscal Year Prior
Revolving Loans Amortized Cost Basis
Revolving Loans Converted to Term
Total
Substandard [Member] \| Commercial real estate [Member]
One-to-four family residential
Term Loans Amortized Cost Basis by Origination Fiscal Year 2025/ 2024
Term Loans Amortized Cost Basis by Origination Fiscal Year 2024/ 2023
Term Loans Amortized Cost Basis by Origination Fiscal Year 2023/ 2022
Term Loans Amortized Cost Basis by Origination Fiscal Year 2022/ 2021
Term Loans Amortized Cost Basis by Origination Fiscal Year 2021/ 2020
Term Loans Amortized Cost Basis by Origination Fiscal Year Prior		116
Revolving Loans Amortized Cost Basis
Revolving Loans Converted to Term
Total		116
Substandard [Member] \| Construction and land [Member]
One-to-four family residential
Term Loans Amortized Cost Basis by Origination Fiscal Year 2025/ 2024
Term Loans Amortized Cost Basis by Origination Fiscal Year 2024/ 2023
Term Loans Amortized Cost Basis by Origination Fiscal Year 2023/ 2022
Term Loans Amortized Cost Basis by Origination Fiscal Year 2022/ 2021
Term Loans Amortized Cost Basis by Origination Fiscal Year 2021/ 2020
Term Loans Amortized Cost Basis by Origination Fiscal Year Prior
Revolving Loans Amortized Cost Basis
Revolving Loans Converted to Term
Total
Substandard [Member] \| Commercial Business [Member]
One-to-four family residential
Term Loans Amortized Cost Basis by Origination Fiscal Year 2025/ 2024
Term Loans Amortized Cost Basis by Origination Fiscal Year 2024/ 2023
Term Loans Amortized Cost Basis by Origination Fiscal Year 2023/ 2022
Term Loans Amortized Cost Basis by Origination Fiscal Year 2022/ 2021
Term Loans Amortized Cost Basis by Origination Fiscal Year 2021/ 2020
Term Loans Amortized Cost Basis by Origination Fiscal Year Prior
Revolving Loans Amortized Cost Basis
Revolving Loans Converted to Term
Total
Doubtful [Member] \| Commercial real estate [Member]
One-to-four family residential
Term Loans Amortized Cost Basis by Origination Fiscal Year 2025/ 2024
Term Loans Amortized Cost Basis by Origination Fiscal Year 2024/ 2023
Term Loans Amortized Cost Basis by Origination Fiscal Year 2023/ 2022
Term Loans Amortized Cost Basis by Origination Fiscal Year 2022/ 2021
Term Loans Amortized Cost Basis by Origination Fiscal Year 2021/ 2020
Term Loans Amortized Cost Basis by Origination Fiscal Year Prior
Revolving Loans Amortized Cost Basis
Revolving Loans Converted to Term
Total
Doubtful [Member] \| Construction and land [Member]
One-to-four family residential
Term Loans Amortized Cost Basis by Origination Fiscal Year 2025/ 2024
Term Loans Amortized Cost Basis by Origination Fiscal Year 2024/ 2023
Term Loans Amortized Cost Basis by Origination Fiscal Year 2023/ 2022
Term Loans Amortized Cost Basis by Origination Fiscal Year 2022/ 2021
Term Loans Amortized Cost Basis by Origination Fiscal Year 2021/ 2020
Term Loans Amortized Cost Basis by Origination Fiscal Year Prior
Revolving Loans Amortized Cost Basis
Revolving Loans Converted to Term
Total
Doubtful [Member] \| Commercial Business [Member]
One-to-four family residential
Term Loans Amortized Cost Basis by Origination Fiscal Year 2025/ 2024
Term Loans Amortized Cost Basis by Origination Fiscal Year 2024/ 2023
Term Loans Amortized Cost Basis by Origination Fiscal Year 2023/ 2022
Term Loans Amortized Cost Basis by Origination Fiscal Year 2022/ 2021
Term Loans Amortized Cost Basis by Origination Fiscal Year 2021/ 2020
Term Loans Amortized Cost Basis by Origination Fiscal Year Prior
Revolving Loans Amortized Cost Basis
Revolving Loans Converted to Term
Total

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Amortized cost of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease.

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Amount of writeoff of financing receivable originated three years before current fiscal year. Excludes net investment in lease.

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