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Acquisitions - Goodwill and Pro forma information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Oct. 01, 2017
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Unaudited pro forma information        
Net sales   $ 340,700 $ 335,300  
Net income attributable to Cubic   (9,800) (3,300)  
Adjustments made for transaction expenses   0 $ 0  
Changes in the carrying amount of goodwill        
Balance at the beginning of the period $ 415,912 415,912    
Foreign currency exchange rate changes   372    
Balance at the end of the period   $ 416,284   $ 415,912
Discount rate (as a percent)   11.00%    
Transportation Systems        
Changes in the carrying amount of goodwill        
Balance at the beginning of the period 50,870 $ 50,870    
Foreign currency exchange rate changes   342    
Balance at the end of the period   51,212   $ 50,870
Transportation Systems | Minimum        
Changes in the carrying amount of goodwill        
Estimated percentage of excess of fair value over carrying value       100.00%
Defense Systems        
Changes in the carrying amount of goodwill        
Balance at the beginning of the period $ 270,692 270,692    
Reassignment in the first quarter of 2018   (125,321)    
Foreign currency exchange rate changes   16    
Balance at the end of the period   145,387   $ 270,692
Defense Systems | Minimum        
Changes in the carrying amount of goodwill        
Estimated percentage of excess of fair value over carrying value       10.00%
Cubic Mission Solutions        
Changes in the carrying amount of goodwill        
Reassignment in the first quarter of 2018   125,321    
Foreign currency exchange rate changes   14    
Balance at the end of the period   $ 125,335    
Discount rate (as a percent)   13.00%    
Cubic Mission Solutions | Minimum        
Changes in the carrying amount of goodwill        
Estimated percentage of excess of fair value over carrying value 25.00%      
Cubic Global Defense Services        
Changes in the carrying amount of goodwill        
Balance at the beginning of the period $ 94,350 $ 94,350    
Balance at the end of the period   $ 94,350   $ 94,350
Cubic Global Defense Services | Minimum        
Changes in the carrying amount of goodwill        
Estimated percentage of excess of fair value over carrying value 10.00%