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Investments & Fair Value Measurements - AFS Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022
Amortized Cost
Due within 1 year	$ 197,051	$ 336,291
Due in 1 to 2 years	60,640	53,721
Due in 2 to 5 years	30,341	42,122
Total	288,032	432,134
Fair Value
Due within 1 year	195,862	334,537
Due in 1 to 2 years	58,964	51,332
Due in 2 to 5 years	29,962	40,280
Debt Securities, Available-for-sale	$ 284,788	$ 426,149

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Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Two

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 3A
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-Publisher FASB
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

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