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Inventories - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Sep. 30, 2014
Inventory Disclosure [Abstract]      
Inventories transferred to rental equipment $ 0.1geos_InventoriesTransferredToRentalEquipment $ 6.9geos_InventoriesTransferredToRentalEquipment  
Raw materials include semi-finished goods and component parts $ 41.9us-gaap_InventoryWorkInProcessNetOfReserves   $ 43.6us-gaap_InventoryWorkInProcessNetOfReserves