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Inventories (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Sep. 30, 2014
Inventory Disclosure [Abstract]    
Finished goods inventory that has been shipped, but for which all revenue recognition criteria has not been met   $ 0.4us-gaap_OtherInventoryCapitalizedCosts
Reservce for obsolescence $ 4.7us-gaap_InventoryValuationReserves $ 4.6us-gaap_InventoryValuationReserves