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Inventories - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2015
Inventory Disclosure [Abstract]      
Excess of current costs at FIFO over LIFO stated values $ 4,700 $ 4,700  
Decrease in cost of sales 189 205 $ 87
Net earnings $ 125 $ 129 $ 55