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Restricted Investments - Summary of Debt Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Sep. 30, 2022
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Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | $ 11,720 | $ 7,432
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 417 | 566
Fair Value | 11,303 | 6,866
Corporate debt securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 3,904 | 2,797
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 188 | 260
Fair Value | 3,716 | 2,537
U.S. government securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 5,724 | 2,622
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 98 | 141
Fair Value | 5,626 | 2,481
Municipal government securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 1,148 | 1,151
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 76 | 96
Fair Value | 1,072 | 1,055
Agency backed securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 944 | 862
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 55 | 69
Fair Value | $ 889 | $ 793

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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- Definition Amortized cost excluding accrued interest, after allowance for credit loss, of 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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- Definition Amount excluding accrued interest, of 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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