Long-Term Debt and Arrangements with Financial Institutions - Additional Information (Detail) - USD ($)	Sep. 30, 2022	Sep. 30, 2021	Apr. 30, 2020
Debt Disclosure [Abstract]
Long term debt outstanding	$ 0	$ 0
Total cash deposits with insurance companies covering collateral needs	$ 85,000
Proceeds from lines of credit			$ 150,000

Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant