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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 |  |

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- Definition Amount of accumulated benefit obligation attributable to the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 7 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450678-114947 + Details
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- Definition Amount of plan assets attributable to the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 7 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450678-114947 + Details
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