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Segment Geographic and Significant Customer Information - Significant Customers (Detail) - Net Revenue - Customer Concentration Risk
12 Months Ended
Apr. 26, 2019
Apr. 27, 2018
Apr. 28, 2017
Arrow Electronics, Inc.      
Segment Reporting Information [Line Items]      
Percentage of net revenues 24.00% 23.00% 22.00%
Tech Data Corporation      
Segment Reporting Information [Line Items]      
Percentage of net revenues 20.00% 20.00% 20.00%