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Captive Insurance Collateral - Schedule of Captive Insurance Collateral to be Available-for-sale Investments (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | $ 69,112 | $ 68,951
Gross Unrealized Gain | 782 | 1,053
Gross Unrealized (Loss) | (412) | (71)
Fair Value | 69,482 | 69,933
Cash and Receivables |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 2,960 | 515
Fair Value | 2,960 | 515
U.S. Government Sponsored Agencies |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 49,872 | 51,632
Gross Unrealized Gain | 78 | 108
Gross Unrealized (Loss) | (379) | (53)
Fair Value | 49,571 | 51,687
Corporate Debt Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 16,280 | 16,302
Gross Unrealized Gain | 704 | 918
Gross Unrealized (Loss) | (33) | (18)
Fair Value | 16,951 | 17,202
Foreign Bonds and Notes |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 0 | 502
Gross Unrealized Gain | 0 | 27
Gross Unrealized (Loss) | 0 | 0
Fair Value | $ 0 | $ 529

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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 http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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