Lead Testing Matters - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Accrued Recall and related notification payable	$ 430	$ 5,100
Loss Contingency, Estimate of Possible Loss	10,000
DOJ Subpoena [Member]
Legal fees	$ 3,510	$ 2,803	$ 2,035
Litigation filing date	April 17, 2018