Benefit Plans (Details) participant in Millions, $ in Millions	1 Months Ended	12 Months Ended
	Apr. 30, 2013	Sep. 30, 2017 USD ($) participant company employee	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Employee contributions match		$ 0.3	$ 0.2	$ 0.2
Multiemployer Plans, Pension
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plan, coverage ratio of plan assets to obligations		102.20%
Multiemployer Plans, Pension | Pensioenfonds Metaal en Techniek (PMT)
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plan, number of employees | participant		1.2
Multiemployer plan, number of companies covered | company		33,000
Multiemployer plan, contribution rate (less than)		5.00%
Multiemployer plan, coverage ratio of plan assets to obligations		105.00%
Multiemployer plan, assets		$ 80,700.0
Multiemployer plans, accumulated benefit obligations		$ 78,900.0
Multiemployer Plans, Pension | Pensioenfonds Metaal en Techniek (PMT) | Maximum
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plan, coverage ratio of plan assets to obligations		102.20%
Multiemployer Plans, Pension | Pensioenfonds Metaal en Techniek (PMT) | Minimum
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plan, coverage ratio of plan assets to obligations		93.60%
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%
The Netherlands | Multiemployer Plans, Pension | Pensioenfonds Metaal en Techniek (PMT)
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plan, number of employees | employee		123