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Redeemable Convertible Notes (Details) - USD ($)
$ in Millions
Aug. 31, 2017
Sep. 01, 2016
Debt Instrument [Line Items]    
Redeemable convertible notes $ 21 $ 0
2033E and 2033F convertible senior notes    
Debt Instrument [Line Items]    
Redeemable convertible notes $ 21