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Segment Geographic and Significant Customer Information - Significant Customers (Detail) - Net Revenue - Customer Concentration Risk
3 Months Ended 6 Months Ended
Oct. 26, 2018
Oct. 27, 2017
Oct. 26, 2018
Oct. 27, 2017
Arrow Electronics, Inc.        
Segment Reporting Information [Line Items]        
Percentage of net revenues 24.00% 22.00% 23.00% 23.00%
Tech Data Corporation        
Segment Reporting Information [Line Items]        
Percentage of net revenues 21.00% 19.00% 19.00% 20.00%