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Commitments And Contingencies (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Feb. 29, 2016
Nov. 30, 2014
Aug. 31, 2016
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2012
Site Contingency [Line Items]            
Lease expense     $ 5.0 $ 4.5 $ 4.0  
Lindsay, Nebraska Facility [Member]            
Site Contingency [Line Items]            
Environmental Remediation Expense $ 13.0 $ 1.5       $ 7.2
Current environmental remediation accrual     $ 19.0