Trade Accounts Receivable Securitization and Sale Programs - Narrative (Details)	9 Months Ended
	May 31, 2018 asset-backed_securitization_program uncommitted_trade_accounts_receivable_sale_program
Trade Accounts Receivable Securitization and Sale Program [Line Items]
Number of asset-backed securitization programs | asset-backed_securitization_program	2
Number of uncommitted trade accounts receivable sale programs | uncommitted_trade_accounts_receivable_sale_program	7
Asset-Backed Securitization Programs
Trade Accounts Receivable Securitization and Sale Program [Line Items]
Percentage of trade accounts receivable sold to conduits by special purpose entities	100.00%