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Concentration of Risk and Segment Data (Concentration of Risk) (Details) - Apple, Inc.
12 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Net Revenue      
Revenue, Major Customer [Line Items]      
Concentration of risk percentage 22.00% 28.00% 24.00%
Accounts Receivable      
Revenue, Major Customer [Line Items]      
Concentration of risk percentage