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Variable Interest Entities - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Mar. 31, 2018
Dec. 31, 2018
Oct. 01, 2018
Sep. 30, 2018
Dec. 31, 2017
Revenue recognition          
Restricted cash       $ 27,400 $ 11,800
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01          
Revenue recognition          
Contract term   12 months      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01          
Revenue recognition          
Contract term   24 months      
Revolving Credit Agreement          
Revenue recognition          
Unamortized Debt Issuance Expense   $ 1,700      
Maximum borrowing capacity under credit agreement   400,000      
Borrowings outstanding   $ 64,500      
MBTA | Design and Build Phase | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01          
Revenue recognition          
Contract term   3 years      
MBTA | Operate and Maintain Phase | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01          
Revenue recognition          
Contract term   10 years      
Cubic Corporation Excluding VIE          
Revenue recognition          
Restricted cash   $ 17,889 $ 17,400 17,400  
Long-term capitalized contract costs       84,924  
OpCo.          
Revenue recognition          
Restricted cash   10,000 $ 10,000 10,000  
Long-term capitalized contract costs       1,258  
OpCo. | Interest Rate Swaps | Not Designated as Hedging Instrument          
Revenue recognition          
Unrealized loss   (6,100)      
P3 Joint Venture          
Revenue recognition          
Maximum exposure to loss   2,700      
OpCo. | Interest Rate Swaps | Not Designated as Hedging Instrument          
Revenue recognition          
Notional principal outstanding derivative instruments   61,900      
OpCo. | Interest Rate Swaps | Not Designated as Hedging Instrument | Other noncurrent liabilities          
Revenue recognition          
Fair value interest rate swaps   6,100      
OpCo. | P3 Credit Agreement | Revolving Credit Agreement          
Revenue recognition          
Maximum borrowing capacity under credit agreement   13,900      
OpCo. | P3 Credit Agreement | Long-term Debt Facility          
Revenue recognition          
Loan amount $ 212,400        
Proceeds from issuance of debt   15,400      
Carrying value   8,800      
OpCo. | Design and Build Phase | P3 Credit Agreement | Long-term Debt Facility | LIBOR          
Revenue recognition          
Variable interest rate (as a percent) 1.30%        
OpCo. | Operate and Maintain Phase | P3 Credit Agreement | Long-term Debt Facility | LIBOR          
Revenue recognition          
Variable interest rate (as a percent) 1.55%        
OpCo. | MBTA          
Revenue recognition          
Expected contract revenue   $ 558,500      
OpCo. | Cubic Corporation Excluding VIE | MBTA          
Revenue recognition          
Long-term capitalized contract costs       $ 27,800  
Transportation Systems | HoldCo.          
Revenue recognition          
Ownership percentage   10.00%      
Transportation Systems | HoldCo. | Letter of credit agreement          
Revenue recognition          
Maximum borrowing capacity under credit agreement   $ 2,700      
Borrowings outstanding   0      
Transportation Systems | OpCo.          
Revenue recognition          
Expected contract revenue   $ 427,600      
John Laing | HoldCo.          
Revenue recognition          
Ownership percentage   90.00%      
John Laing | HoldCo. | Equity Bridge Loan          
Revenue recognition          
Loan amount $ 24,300