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Summary of Significant Accounting Policies (Details) - USD ($)
3 Months Ended
Nov. 30, 2017
Nov. 30, 2016
Aug. 31, 2017
Feb. 28, 2017
Significant Accounting Policies [Line Items]        
Book Overdrafts $ 30,000,000   $ 21,000,000  
Cost Method Investment, Original Cost       $ 6,000,000
Cost Method Investment, Carrying Value 6,000,000   6,000,000  
Cash, FDIC Insured Amount 250,000      
Customer Issued Letters Of Credit 44,000,000   $ 48,000,000  
Cascade Steel and Scrap        
Significant Accounting Policies [Line Items]        
Accelerated Depreciation (less than $1 million for 2016) 1,000,000 $ 1,000,000    
Gain on Sale of Assets $ 1,000,000