Summary of Significant Accounting Policies - Additional Information (Details 2) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Summary Of Significant Accounting Policies [Line Items]
Percentage of importance to income approach used for evaluation of recoverability of goodwill (as a percent)	75.00%
Net foreign currency transaction gains (losses) related to continuing operations	$ (2.7)	$ 2.1	$ (3.8)
Minimum | Buildings and Improvements
Summary Of Significant Accounting Policies [Line Items]
Useful life	10 years
Minimum | Machinery and Equipment
Summary Of Significant Accounting Policies [Line Items]
Useful life	4 years
Minimum | Software and Related Costs
Summary Of Significant Accounting Policies [Line Items]
Useful life	3 years
Maximum | Buildings and Improvements
Summary Of Significant Accounting Policies [Line Items]
Useful life	40 years
Maximum | Machinery and Equipment
Summary Of Significant Accounting Policies [Line Items]
Useful life	25 years
Maximum | Software and Related Costs
Summary Of Significant Accounting Policies [Line Items]
Useful life	10 years