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Commitments and Contingencies - Additional Information (Details) |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 08, 2017 USD ($) | Nov. 02, 2016 patent | Apr. 21, 2016 patent | Mar. 31, 2018 USD ($) claim | Nov. 02, 2016 patent
Siemens Industry, Inc. | Pending Litigation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Patents allegedly infringed | patent |  | 6 | 7 |  | 10
Patents violated | patent |  |  |  |  | 3
Subsidiaries | Denver Transit | Threatened Litigation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of claims filed (claims) | claim |  |  |  | 0 |
Subsidiaries | Denver Transit, Delivery of Train Management System | Threatened Litigation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Damages alleged | $ |  |  |  | $ 0 |
Subsidiaries | Denver Transit, Installation of Constant Wireless Crossings | Threatened Litigation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Damages alleged | $ | $ 36,800,000 |  |  |  |

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