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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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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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