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Captive Insurance Collateral - Schedule of Captive Insurance Collateral to be Available-for-sale Investments (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | $ 78,311 | $ 75,301
Gross Unrealized Gain | 79 | 108
Gross Unrealized (Loss) | (201) | (558)
Fair Value | 78,189 | 74,851
Cash and Receivables |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 343 | 5,741
Gross Unrealized Gain | 0 | 0
Gross Unrealized (Loss) | 0 | 0
Fair Value | 343 | 5,741
U.S. Government Debt Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 71,453 |
Gross Unrealized Gain | 79 |
Gross Unrealized (Loss) | (11) |
Fair Value | 71,521 |
U.S. Government Sponsored Agencies |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost |  | 57,095
Gross Unrealized Gain |  | 108
Gross Unrealized (Loss) |  | (104)
Fair Value |  | 57,099
Corporate Debt Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 6,515 | 12,465
Gross Unrealized Gain | 0 | 0
Gross Unrealized (Loss) | (190) | (454)
Fair Value | $ 6,325 | $ 12,011

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