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Acquisitions - Solbar Industries Ltd. Acquisition (Details) (USD $)
12 Months Ended 0 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Feb. 09, 2012
Ag Business
Solbar Industries Ltd. [Member]
Business Acquisition [Line Items]        
Payments to Acquire Businesses, Net of Cash Acquired $ 281,490,000 $ 12,711,000 $ 166,033,000 $ 128,700,000
Cash acquired in acquisition       6,600,000
Asset Impairment Charges $ 74,500,000