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Segment Geographic and Significant Customer Information - Significant Customers (Detail) - Net Revenue - Customer Concentration Risk
3 Months Ended
Jul. 27, 2018
Jul. 28, 2017
Arrow Electronics, Inc.    
Segment Reporting Information [Line Items]    
Percentage of net revenues 22.00% 23.00%
Tech Data Corporation    
Segment Reporting Information [Line Items]    
Percentage of net revenues 17.00% 20.00%