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Commitments and Contingencies (Details) - USD ($) $ in Millions | Jan. 31, 2019 | Sep. 08, 2017
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Positive Train Control Patents | Siemens Industry, Inc. | Settled Litigation |  |
Loss Contingencies [Line Items] |  |
Damages awarded | $ 5.6 |
End of Train Patents | Siemens Industry, Inc. | Settled Litigation |  |
Loss Contingencies [Line Items] |  |
Damages awarded | $ 1.1 |
Subsidiaries | Denver Transit, Installation of Constant Wireless Crossings | Threatened Litigation |  |
Loss Contingencies [Line Items] |  |
Damages alleged |  | $ 36.8

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