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Acquisitions and Divestitures - Goodwill and Pro forma information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
Unaudited pro forma information          
Net sales $ 321,500 $ 342,300 $ 654,600 $ 665,800  
Net loss attributable to Cubic (39,300) $ (17,700) (68,100) $ (33,300)  
Adjustments made for transaction expenses     0    
Changes in the carrying amount of goodwill          
Net balances at the beginning of the period     578,097    
Acquisitions     202,689    
Adjustments     603    
Foreign currency exchange rate changes     294    
Net balance at the end of the period 781,683   781,683   $ 578,097
Cubic Transportation Systems          
Changes in the carrying amount of goodwill          
Net balances at the beginning of the period     254,592    
Acquisitions     30,621    
Adjustments     603    
Foreign currency exchange rate changes     385    
Net balance at the end of the period 286,201   286,201   $ 254,592
Cubic Transportation Systems | Minimum          
Changes in the carrying amount of goodwill          
Estimated percentage of excess of fair value over carrying value         100.00%
Cubic Mission Solutions          
Changes in the carrying amount of goodwill          
Net balances at the beginning of the period     181,424    
Acquisitions     172,068    
Foreign currency exchange rate changes     99    
Net balance at the end of the period 353,591   353,591   $ 181,424
Cubic Mission Solutions | Minimum          
Changes in the carrying amount of goodwill          
Estimated percentage of excess of fair value over carrying value         60.00%
Cubic Global Defense Systems          
Changes in the carrying amount of goodwill          
Net balances at the beginning of the period     142,081    
Foreign currency exchange rate changes     (190)    
Net balance at the end of the period $ 141,891   $ 141,891   $ 142,081
Cubic Global Defense Systems | Minimum          
Changes in the carrying amount of goodwill          
Estimated percentage of excess of fair value over carrying value         100.00%