Annual report pursuant to Section 13 and 15(d)

Concentration of Credit Risk and Significant Customers and Suppliers - Additional Information (Detail)

v3.8.0.1
Concentration of Credit Risk and Significant Customers and Suppliers - Additional Information (Detail)
12 Months Ended
Sep. 30, 2017
Sep. 24, 2016
Sep. 26, 2015
Concentration Risk [Line Items]      
Percentage of net sales 44.00% 42.00% 40.00%
Percentage of accounts receivable 44.00% 41.00%  
Percentage of accounts receivable including Company's largest customer 10.00% 11.00%  
Percentage of cost of goods sold 9.00% 9.00% 11.00%
Sales Revenue, Net | Customer Concentration Risk | Customer One      
Concentration Risk [Line Items]      
Percentage of largest customer accounted of the Company's net sales 16.00% 15.00% 16.00%
Sales Revenue, Net | Customer Concentration Risk | Customer Two      
Concentration Risk [Line Items]      
Percentage of largest customer accounted of the Company's net sales 8.00%    
Sales Revenue, Net | Customer Concentration Risk | Customer Three      
Concentration Risk [Line Items]      
Percentage of largest customer accounted of the Company's net sales 8.00% 8.00% 7.00%