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Inventories - Additional Information (Detail) (USD $)
12 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 29, 2012
Inventory Disclosure [Abstract]      
Excess of current costs at FIFO over LIFO stated values $ 5,000,000 $ 5,000,000  
Decrease in cost of sales 25,000 400,000  
Net earnings 16,000 300,000  
Liquidations of LIFO inventories     $ 0