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Acquisitions and Divestitures - Goodwill and Pro forma information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 01, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2017
Unaudited pro forma information            
Net sales   $ 296,200 $ 267,000 $ 823,700 $ 761,200  
Net income attributable to Cubic   7,300 (78,600) (8,400) (36,900)  
Adjustments made for transaction expenses   0 $ 0 0 $ 0  
Changes in the carrying amount of goodwill            
Balance at the beginning of the period $ 321,562     321,562    
Acquisitions       7,341    
Foreign currency exchange rate changes       (939)    
Balance at the end of the period   327,964   $ 327,964   $ 321,562
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       (556)    
Balance at the end of the period   50,314   50,314   $ 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 on October 1, 2017       (125,321)    
Acquisitions       665    
Foreign currency exchange rate changes       (870)    
Balance at the end of the period   145,166   145,166   $ 270,692
Cubic Mission Solutions            
Changes in the carrying amount of goodwill            
Reassignment on October 1, 2017       125,321    
Acquisitions       6,676    
Foreign currency exchange rate changes       487    
Balance at the end of the period   $ 132,484   $ 132,484    
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 | Minimum            
Changes in the carrying amount of goodwill            
Estimated percentage of excess of fair value over carrying value 10.00%