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Risks and Contingencies (Details) $ in Thousands						1 Months Ended	3 Months Ended
	Sep. 25, 2017 item	Sep. 22, 2017 item	Jan. 29, 2016 item	Sep. 30, 2015 item	Apr. 17, 2015 item	Mar. 31, 2016 item	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)
Loss Contingencies [Line Items]
Contingent liability charges | $							$ 1,450	$ 2,850
Freight Car America v National Steel Car Limited [Member]
Loss Contingencies [Line Items]
Number of unpatentable patents	2	2
Number of new complaints			18
Patents				5	5
Freight Car America v National Steel Car Limited [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Patents						2

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Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

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The total number of new claims filed pertaining to a loss contingency during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

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Number of another entity's patents that the entity has allegedly infringed.

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Number of another entity's patents that the entity was found to have infringed.

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