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Captive Insurance Collateral - Schedule of Captive Insurance Collateral to be Available-for-sale Investments (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | $ 70,633 | $ 68,951
Gross Unrealized Gain | 0 | 1,053
Gross Unrealized (Loss) | (3,971) | (71)
Fair Value | 66,662 | 69,933
Cash and Receivables |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 1,838 | 515
Gross Unrealized Gain | 0 | 0
Gross Unrealized (Loss) | 0 | 0
Fair Value | 1,838 | 515
U.S. Government Sponsored Agencies |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 48,473 | 51,632
Gross Unrealized Gain | 0 | 108
Gross Unrealized (Loss) | (3,052) | (53)
Fair Value | 45,421 | 51,687
Corporate Debt Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 20,322 | 16,302
Gross Unrealized Gain | 0 | 918
Gross Unrealized (Loss) | (919) | (18)
Fair Value | $ 19,403 | 17,202
Foreign Bonds and Notes |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost |  | 502
Gross Unrealized Gain |  | 27
Gross Unrealized (Loss) |  | 0
Fair Value |  | $ 529

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