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Variable Interest Entities - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Oct. 01, 2018
Revenue recognition        
Borrowings outstanding   $ 39,900    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01        
Revenue recognition        
Contract term   12 months    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01        
Revenue recognition        
Contract term   24 months    
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   $ 19,507 $ 17,400 $ 17,400
Long-term capitalized contract costs     84,924  
OpCo.        
Revenue recognition        
Restricted cash   9,967 10,000 $ 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   137,400 38,600  
Fair value interest rate swaps   21,600 0  
Unrealized loss due to fair value changes   21,600 $ 0  
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   62,000    
Unamortized Debt Issuance Expense   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    
P3 Joint Venture        
Revenue recognition        
Maximum exposure to loss   2,700    
Cubic Transportation Systems | OpCo.        
Revenue recognition        
Expected contract revenue   $ 427,600    
Cubic Transportation Systems | HoldCo.        
Revenue recognition        
Ownership percentage   10.00%    
Cubic 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