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Restructurings- Additional Details (Details)
 3 Months Ended 12 Months Ended
Jun. 28, 2019
USD ($)
facility
employee
Sep. 27, 2019
USD ($)
Sep. 28, 2018
USD ($)
Sep. 29, 2017
USD ($)
Restructuring Cost and Reserve [Line Items]        
Restructuring cost   $ 19,543,000 $ 6,265,000 $ 2,744,000
Payments for restructuring   17,105,000 6,803,000  
Facility related expenses        
Restructuring Cost and Reserve [Line Items]        
Restructuring cost   11,459,000 3,476,000 0
Payments for restructuring   10,481,000 3,476,000  
Employee related costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring cost   8,084,000 2,789,000 $ 2,744,000
Payments for restructuring   6,624,000 3,327,000  
Long Beach, Belfast and Sydney Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring cost   0 6,265,000  
Payments for restructuring   89,000 6,176,000  
Expected remaining restructuring costs   0    
Long Beach, Belfast and Sydney Restructuring Plan | Facility related expenses        
Restructuring Cost and Reserve [Line Items]        
Restructuring cost   0 3,476,000  
Payments for restructuring   0 3,476,000  
Long Beach, Belfast and Sydney Restructuring Plan | Employee related costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring cost   0 2,789,000  
Payments for restructuring   89,000 $ 2,700,000  
Ithaca Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring cost   5,450,000    
Payments for restructuring   5,367,000    
Ithaca Restructuring Plan | Facility related expenses        
Restructuring Cost and Reserve [Line Items]        
Restructuring cost   3,969,000    
Payments for restructuring   3,899,000    
Ithaca Restructuring Plan | Employee related costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring cost   1,481,000    
Payments for restructuring   1,468,000    
Design Facility Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring cost   2,528,000    
Payments for restructuring   2,077,000    
Design Facility Restructuring Plan | Facility related expenses        
Restructuring Cost and Reserve [Line Items]        
Restructuring cost   2,190,000    
Payments for restructuring   1,739,000    
Design Facility Restructuring Plan | Employee related costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring cost   338,000    
Payments for restructuring   338,000    
2019 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Restructuring cost   11,565,000    
Payments for restructuring   9,572,000    
Number of positions eliminated | employee 250      
Number of facilities | facility 7      
2019 Restructuring Plan | Minimum        
Restructuring Cost and Reserve [Line Items]        
Expected remaining restructuring costs   2,500,000    
Expected cost   14,100,000    
2019 Restructuring Plan | Maximum        
Restructuring Cost and Reserve [Line Items]        
Expected remaining restructuring costs   3,400,000    
Expected cost   15,000,000.0    
2019 Restructuring Plan | Facility related expenses        
Restructuring Cost and Reserve [Line Items]        
Restructuring cost   5,300,000    
Payments for restructuring   4,843,000    
2019 Restructuring Plan | Facility related expenses | Maximum        
Restructuring Cost and Reserve [Line Items]        
Expected remaining restructuring costs $ 800,000      
2019 Restructuring Plan | Other Costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring cost   1,300,000    
2019 Restructuring Plan | Employee related costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring cost   6,265,000    
Payments for restructuring   4,729,000    
2019 Restructuring Plan | Employee related costs | Maximum        
Restructuring Cost and Reserve [Line Items]        
Expected remaining restructuring costs   2,600,000    
2019 Restructuring Plan | Fixed Asset Impairment        
Restructuring Cost and Reserve [Line Items]        
Restructuring cost   $ 4,000,000.0