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Revenue - Fulfillment Costs (Details)
3 Months Ended 9 Months Ended
May 31, 2019
USD ($)
May 31, 2019
USD ($)
Capitalized Contract Cost [Line Items]    
Capitalized costs $ 74,400,000 $ 74,400,000
Amortization 9,800,000 29,700,000
Impairment costs $ 0 $ 0
Minimum    
Capitalized Contract Cost [Line Items]    
Capitalized cost, amortization period 1 year 1 year
Maximum    
Capitalized Contract Cost [Line Items]    
Capitalized cost, amortization period 3 years 3 years