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Variable Interest Entities - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Mar. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Revenue recognition      
Restricted cash   $ 27,400 $ 8,400
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   $ 17,400 8,434
Long-term capitalized contract costs   84,924 $ 56,471
Cubic Corporation Excluding VIE | MBTA      
Revenue recognition      
Long-term capitalized contract costs   27,800  
OpCo.      
Revenue recognition      
Restricted cash   10,000  
Long-term capitalized contract costs   1,258  
OpCo. | Interest Rate Swaps | Not Designated as Hedging Instrument      
Revenue recognition      
Notional principal outstanding derivative instruments   38,600  
Fair value interest rate swaps   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    
Carrying value   17,800  
Unamortized deferred financing costs   8,700  
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   664,000  
P3 Joint Venture      
Revenue recognition      
Maximum exposure to loss   2,700  
Transportation Systems | OpCo.      
Revenue recognition      
Expected contract revenue   $ 510,000  
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  
John Laing | HoldCo.      
Revenue recognition      
Ownership percentage   90.00%  
John Laing | HoldCo. | Equity Bridge Loan      
Revenue recognition      
Loan amount $ 24,300    
VIE      
Revenue recognition      
Restricted cash   $ 10,000  
Long-term capitalized contract costs   $ 1,258