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Inventories - Narrative (Details) (USD $)
In Millions, unless otherwise specified
Feb. 28, 2014
Aug. 31, 2013
Feb. 28, 2013
Inventory Disclosure [Abstract]      
Percentage of LIFO inventory 14.00% 16.00% 14.00%
LIFO inventory, difference amount had FIFO inventory valuation method been used $ 579.4 $ 652.6 $ 535.1