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Related Parties - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2013
Feb. 29, 2012
Related Party Transaction [Line Items]        
Sales to tractor supply $ 0.2 $ 0.2 $ 0.4 $ 0.3
Accounts receivable from tractor supply $ 0.1   $ 0.1