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Risks and Contingencies (Details) $ in Thousands				1 Months Ended	3 Months Ended
	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 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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
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The total number of new claims filed pertaining to a loss contingency during the period.

+ References

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

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