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Captive Insurance Collateral - Schedule of Captive Insurance Collateral to be Available-for-sale Investments (Detail) - USD ($) $ in Thousands		Sep. 30, 2019	Sep. 30, 2018
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		$ 57,461	$ 46,623
Gross Unrealized Gain		1,032
Gross Unrealized (Loss)		(3)	(1,204)
Fair Value	[1]	58,490	45,419
Cash and Receivables
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		509	350
Fair Value		509	350
U.S. Government Sponsored Agencies
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		29,055	10,735
Gross Unrealized Gain		198
Gross Unrealized (Loss)		(3)	(192)
Fair Value		29,250	10,543
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		23,831	30,427
Gross Unrealized Gain		773
Gross Unrealized (Loss)			(928)
Fair Value		24,604	29,499
Foreign Bonds and Notes
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		4,066	5,111
Gross Unrealized Gain		61
Gross Unrealized (Loss)			(84)
Fair Value		$ 4,127	$ 5,027
[1] See Note 2 – Summary of Significant Accounting Policies - Captive Insurance Collateral.

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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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