Benefit Plans - Additional Information (Details) participant in Millions, $ in Millions	1 Months Ended	12 Months Ended
	Apr. 30, 2013	Sep. 30, 2019 USD ($) employee company participant	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Employee contributions match		$ 0.3	$ 0.4	$ 0.3
Multiemployer Plans, Pension
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plan, coverage ratio of plan assets to obligations		94.60%
Multiemployer Plans, Pension | Pensioenfonds Metaal en Techniek (PMT)
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plan, number of employees | participant		1.4
Multiemployer plan, number of companies covered | company		34,000
Multiemployer plan, contribution rate (less than)		5.00%
Multiemployer plan, coverage ratio of plan assets to obligations		104.30%
Multiemployer plan, assets		$ 94,200.0
Multiemployer plans, accumulated benefit obligations		$ 99,700.0
Multiemployer Plans, Pension | Pensioenfonds Metaal en Techniek (PMT) | Maximum
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plan, coverage ratio of plan assets to obligations		101.90%
Multiemployer Plans, Pension | Pensioenfonds Metaal en Techniek (PMT) | Minimum
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plan, coverage ratio of plan assets to obligations		92.60%
Multiemployer Plans, Pension | Pensioenfonds Metaal en Techniek (PMT) | The Netherlands
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plan, number of employees | employee		75
Multiemployer Plans, Pension | Recovery Plan
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plan, percentage decrease in pension rights	6.30%
Multiemployer plan, premium percentage	16.60%