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Investments - Narrative (Details) - USD ($)	6 Months Ended	12 Months Ended
	Sep. 30, 2025	Mar. 31, 2025
Investments, Debt and Equity Securities [Abstract]
Accrued interest	$ 5,800,000	$ 5,800,000
Unrealized loss on debt securities	0	0
Impairment on debt securities	0	0
Debt securities credit losses	0	0
Debt securities, available-for-sale, unrealized loss position	$ 115,200,000	$ 177,300,000

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- Definition

Debt Securities, Available-for-Sale, Impairment Loss

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Amount, after allowance for credit loss, of accrued interest on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Name Accounting Standards Codification
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-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

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-URI https://asc.fasb.org/1943274/2147479106/326-30-50-3B

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Amount excluding accrued interest, of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
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-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
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Amount of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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