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Captive Insurance Collateral - Schedule of Captive Insurance Collateral to be Available-for-sale Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Sep. 30, 2019
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 64,704	$ 57,461
Gross Unrealized Gain	1,073	1,032
Gross Unrealized (Loss)	(1)	(3)
Fair Value	65,776	58,490
Cash and Receivables
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	5,639	509
Fair Value	5,639	509
U.S. Government Sponsored Agencies
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	33,320	29,055
Gross Unrealized Gain	310	198
Gross Unrealized (Loss)	(1)	(3)
Fair Value	33,629	29,250
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	22,735	23,831
Gross Unrealized Gain	724	773
Fair Value	23,459	24,604
Foreign Bonds and Notes
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	3,010	4,066
Gross Unrealized Gain	39	61
Fair Value	$ 3,049	$ 4,127

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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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