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Inventories - Additional Information (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2017
Inventory Disclosure [Abstract]      
Inventories transferred to rental equipment $ 23.5 $ 1.6  
Raw materials include semi-finished goods and component parts $ 28.7   $ 48.2