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Acquisitions - Solbar Industries Ltd. Acquisition (Details) (USD $)
12 Months Ended 0 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Aug. 31, 2012
Ag Business
Aug. 31, 2011
Ag Business
Aug. 31, 2010
Ag Business
Feb. 09, 2012
Ag Business
Solbar Industries Ltd. [Member]
Business Acquisition [Line Items]              
Cash to receive for each outstanding share of Solbar, Right             $ 4.00
Payments to Acquire Businesses, Net of Cash Acquired $ 166,033,000 $ 67,489,000 $ 6,307,000       $ 128,665,000
Cash acquired in acquisition             6,600,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]              
Current assets             74,240,000
Investments             961,000
Property, plant and equipment             71,324,000
Goodwill 81,693,000 26,409,000 23,038,000 73,630,000 18,346,000 14,975,000 39,794,000
Definite-lived intangible assets             23,306,000
Current liabilities             (63,417,000)
Long-term debt             (15,849,000)
Other liabilities             (1,694,000)
Aggregate base purchase price             $ 128,665,000