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Captive Insurance Collateral - Schedule of Captive Insurance Collateral to be Available-for-sale Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 70,838	$ 70,633
Gross Unrealized Gain	0	0
Gross Unrealized (Loss)	(3,616)	(3,971)
Fair Value	67,222	66,662
Cash and Receivables
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	573	1,838
Gross Unrealized Gain	0	0
Gross Unrealized (Loss)	0	0
Fair Value	573	1,838
U.S. Government Sponsored Agencies
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	49,972	48,473
Gross Unrealized Gain	0	0
Gross Unrealized (Loss)	(2,803)	(3,052)
Fair Value	47,169	45,421
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	20,293	20,322
Gross Unrealized Gain	0	0
Gross Unrealized (Loss)	(813)	(919)
Fair Value	$ 19,480	$ 19,403

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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).

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