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Benefit Plans (Details) participant in Millions, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2013 | Sep. 30, 2018 USD ($) participant employee company | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employee contributions match |  | $ 0.4 | $ 0.3 | $ 0.2
Multiemployer Plans, Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Multiemployer plan, coverage ratio of plan assets to obligations |  | 104.60% |  |
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 |  | 33,000 |  |
Multiemployer plan, contribution rate (less than) |  | 5.00% |  |
Multiemployer plan, coverage ratio of plan assets to obligations |  | 104.30% |  |
Multiemployer plan, assets |  | $ 83,900.0 |  |
Multiemployer plans, accumulated benefit obligations |  | $ 80,200.0 |  |
Multiemployer Plans, Pension | Pensioenfonds Metaal en Techniek (PMT) | Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Multiemployer plan, coverage ratio of plan assets to obligations |  | 104.60% |  |
Multiemployer Plans, Pension | Pensioenfonds Metaal en Techniek (PMT) | Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Multiemployer plan, coverage ratio of plan assets to obligations |  | 101.50% |  |
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 |  | 117 |  |

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