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Captive Insurance Collateral - Schedule of Captive Insurance Collateral to be Available-for-sale Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Sep. 30, 2022
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 71,016	$ 70,633
Gross Unrealized Gain	2	0
Gross Unrealized (Loss)	(2,843)	(3,971)
Fair Value	68,175	66,662
Cash and Receivables
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	781	1,838
Gross Unrealized Gain	0	0
Gross Unrealized (Loss)	0	0
Fair Value	781	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)	(2,196)	(3,052)
Fair Value	47,776	45,421
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	20,263	20,322
Gross Unrealized Gain	2	0
Gross Unrealized (Loss)	(647)	(919)
Fair Value	$ 19,618	$ 19,403

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