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Business Segments and Geographic Information - Revenues by Geography (Detail)
 3 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Schedule Of Geographical Segments [Line Items]    
Revenues 100.00% 100.00%
United States    
Schedule Of Geographical Segments [Line Items]    
Revenues 74.90% 75.50%
Europe    
Schedule Of Geographical Segments [Line Items]    
Revenues 12.20% 11.50%
Asia-Pacific    
Schedule Of Geographical Segments [Line Items]    
Revenues 8.40% 8.70%
Rest of World    
Schedule Of Geographical Segments [Line Items]    
Revenues 4.50% 4.30%