Defined Benefit Pension Plans - Additional Information (Detail) - USD ($) $ in Thousands		6 Months Ended
	Mar. 31, 2023	Sep. 30, 2022	Sep. 30, 2021
Defined Contribution Plan Disclosure [Line Items]
Contributions paid or to be paid by employer		$ 977	$ 819
Scenario, Forecast [Member]
Defined Contribution Plan Disclosure [Line Items]
Contributions paid or to be paid by employer	$ 1,948