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Captive Insurance Collateral - Schedule of Captive Insurance Collateral to be Available-for-sale Investments (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | $ 76,088 | $ 75,301
Gross Unrealized Gain | 20 | 108
Gross Unrealized (Loss) | (424) | (558)
Fair Value | 75,684 | 74,851
Cash and Receivables |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 454 | 5,741
Gross Unrealized Gain | 0 | 0
Gross Unrealized (Loss) | 0 | 0
Fair Value | 454 | 5,741
U.S. Government Debt Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 64,915 | 57,095
Gross Unrealized Gain | 20 | 108
Gross Unrealized (Loss) | (59) | (104)
Fair Value | 64,876 | 57,099
Corporate Debt Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 10,719 | 12,465
Gross Unrealized Gain | 0 | 0
Gross Unrealized (Loss) | (365) | (454)
Fair Value | $ 10,354 | $ 12,011

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