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Significant Accounting Policies - Fiscal Year, Basis of Presentation, Cash Equivalents and Concentration of Credit Risk (Details)
$ in Millions
12 Months Ended
Sep. 28, 2019
USD ($)
months
weeks
Sep. 29, 2018
weeks
Sep. 30, 2017
weeks
Product Information [Line Items]      
Fiscal period, number of weeks | weeks 52 52 52
Cash and cash equivalents held outside of U.S. $ 240.3    
Cash and cash equivalents, foreign operations in foreign currency $ 228.4    
Accounts receivable      
Product Information [Line Items]      
Segment Reporting, Disclosure of Major Customers 2 2  
Accounts receivable | Customer one      
Product Information [Line Items]      
Concentration Risk, Percentage 28.60% 16.40%  
Accounts receivable | Customer two      
Product Information [Line Items]      
Concentration Risk, Percentage   16.70%  
Maximum      
Product Information [Line Items]      
Highly liquid investments maturities (in months) | months 3