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SECURITIES REPURCHASE AGREEMENT OBLIGATIONS - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Sep. 30, 2025	Mar. 31, 2025
Securities Sold under Agreements to Repurchase [Abstract]
Fair value of collateral pledged under repurchase agreements	$ 803,205	$ 1,436,271
Interest payable accrued on securities purchased under reverse repurchase agreements	$ 2,402	$ 4,798
Repurchase agreement, weighted average maturity of agreements	9 days	10 days

X

- Definition

Interest Payable Accrued On Securities Purchased Under Reverse Repurchase Agreements

+ References

No definition available.

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X

- Definition

Weighted average maturity (weighted by amount of the agreement) of repurchase agreements with the counterparty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481420/860-30-50-9

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(m)(1)(iii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

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X

- Definition

Fair value of the securities received as collateral against securities borrowed.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483444/210-20-55-12

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (d)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483466/210-20-50-3

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- References

No definition available.

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