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Trade Accounts Receivable Securitization and Sale Programs - Trade Accounts Receivable Sale Programs Key Terms (Details)
3 Months Ended 6 Months Ended
Feb. 28, 2018
USD ($)
Feb. 28, 2019
USD ($)
Feb. 28, 2018
USD ($)
Feb. 28, 2019
CNY (¥)
Feb. 28, 2019
USD ($)
Trade Accounts Receivable Securitization and Sale Program [Line Items]          
Beneficial interest obtained in exchange for securitized receivables $ 366,300,000 $ 162,200,000 $ 1,100,000,000    
A          
Trade Accounts Receivable Securitization and Sale Program [Line Items]          
Maximum Amount of Net Cash Proceeds         $ 800,000,000
Notice period to cancel receivable sale agreements   15 days      
B          
Trade Accounts Receivable Securitization and Sale Program [Line Items]          
Maximum Amount of Net Cash Proceeds         150,000,000
Notice period to cancel receivable sale agreements   10 days      
C          
Trade Accounts Receivable Securitization and Sale Program [Line Items]          
Maximum Amount of Net Cash Proceeds | ¥       ¥ 800,000,000  
D          
Trade Accounts Receivable Securitization and Sale Program [Line Items]          
Maximum Amount of Net Cash Proceeds         100,000,000
Notice period to cancel receivable sale agreements   30 days      
E          
Trade Accounts Receivable Securitization and Sale Program [Line Items]          
Maximum Amount of Net Cash Proceeds         50,000,000
F          
Trade Accounts Receivable Securitization and Sale Program [Line Items]          
Maximum Amount of Net Cash Proceeds         150,000,000
Threshold period to cancel trade accounts receivable sale agreement before automatic extension   30 days      
G          
Trade Accounts Receivable Securitization and Sale Program [Line Items]          
Maximum Amount of Net Cash Proceeds         50,000,000
Notice period to cancel receivable sale agreements   15 days      
H          
Trade Accounts Receivable Securitization and Sale Program [Line Items]          
Maximum Amount of Net Cash Proceeds         100,000,000
Threshold period to cancel trade accounts receivable sale agreement before automatic extension   30 days      
I          
Trade Accounts Receivable Securitization and Sale Program [Line Items]          
Maximum Amount of Net Cash Proceeds         100,000,000
Threshold period to cancel trade accounts receivable sale agreement before automatic extension   30 days      
J          
Trade Accounts Receivable Securitization and Sale Program [Line Items]          
Maximum Amount of Net Cash Proceeds         $ 150,000,000
Threshold period to cancel trade accounts receivable sale agreement before automatic extension   30 days