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Inventories - Components of Inventories (Detail) (USD $)
In Millions, unless otherwise specified
Apr. 30, 2015
Jan. 31, 2015
Apr. 30, 2014
Inventory Disclosure [Abstract]      
Finished goods $ 1,396.5us-gaap_InventoryFinishedGoodsNetOfReserves $ 1,386.8us-gaap_InventoryFinishedGoodsNetOfReserves $ 1,365.3us-gaap_InventoryFinishedGoodsNetOfReserves
Raw materials 872.8us-gaap_InventoryRawMaterialsNetOfReserves 866.9us-gaap_InventoryRawMaterialsNetOfReserves 921.0us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process 93.7us-gaap_InventoryWorkInProcessNetOfReserves 108.4us-gaap_InventoryWorkInProcessNetOfReserves 132.1us-gaap_InventoryWorkInProcessNetOfReserves
Inventories, net $ 2,363.0us-gaap_InventoryNet $ 2,362.1us-gaap_InventoryNet $ 2,418.4us-gaap_InventoryNet