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Captive Insurance Collateral - Schedule of Captive Insurance Collateral to be Available-for-sale Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 69,203	$ 68,951
Gross Unrealized Gain	138	1,053
Gross Unrealized (Loss)	(1,830)	(71)
Fair Value	67,511	69,933
Cash and Receivables
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,865	515
Fair Value	1,865	515
U.S. Government Sponsored Agencies
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	48,473	51,632
Gross Unrealized Gain	5	108
Gross Unrealized (Loss)	(1,649)	(53)
Fair Value	46,829	51,687
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	18,865	16,302
Gross Unrealized Gain	133	918
Gross Unrealized (Loss)	(181)	(18)
Fair Value	$ 18,817	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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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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