Contingencies - Additional Information (Detail) - Respirator Liabilities [Member] - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Mar. 31, 2021	Sep. 30, 2020
Loss Contingencies [Line Items]
Respirator liability			$ 65.2
Settlement amount		$ 32.6
Description of pending claims				The Company paid $32.6 million of the settlement during the third quarter of fiscal 2020 and the remaining $32.6 million in the first quarter of fiscal 2021.
Respirator reserve				$ 22.0	$ 24.0
Selling and Administrative Expenses [Member]
Loss Contingencies [Line Items]
Respirator charge			$ 50.0
Accounts Payable and Accrued Liabilities [Member]
Loss Contingencies [Line Items]
Settlement amount	$ 32.6