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Restructurings - Summary of Costs Related to Restructuring Actions (Detail) - USD ($)
 12 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Sep. 29, 2017
Restructuring Reserve [Roll Forward]      
Beginning balance $ 89,000 $ 627,000  
Restructuring cost 19,543,000 6,265,000 $ 2,744,000
Charges paid/settled (17,105,000) (6,803,000)  
Ending balance 2,527,000 89,000 627,000
Long Beach, Belfast and Sydney Restructuring Plan      
Restructuring Reserve [Roll Forward]      
Beginning balance 89,000 0  
Restructuring cost 0 6,265,000  
Charges paid/settled (89,000) (6,176,000)  
Ending balance 0 89,000 0
Ithaca Restructuring Plan      
Restructuring Reserve [Roll Forward]      
Beginning balance 0    
Restructuring cost 5,450,000    
Charges paid/settled (5,367,000)    
Ending balance 83,000 0  
Design Facility Restructuring Plan      
Restructuring Reserve [Roll Forward]      
Beginning balance 0    
Restructuring cost 2,528,000    
Charges paid/settled (2,077,000)    
Ending balance 451,000 0  
2019 Restructuring Plan      
Restructuring Reserve [Roll Forward]      
Beginning balance 0    
Restructuring cost 11,565,000    
Charges paid/settled (9,572,000)    
Ending balance 1,993,000 0  
Employee related costs      
Restructuring Reserve [Roll Forward]      
Beginning balance 89,000 627,000  
Restructuring cost 8,084,000 2,789,000 2,744,000
Charges paid/settled (6,624,000) (3,327,000)  
Ending balance 1,549,000 89,000 627,000
Employee related costs | Long Beach, Belfast and Sydney Restructuring Plan      
Restructuring Reserve [Roll Forward]      
Beginning balance 89,000 0  
Restructuring cost 0 2,789,000  
Charges paid/settled (89,000) (2,700,000)  
Ending balance 0 89,000 0
Employee related costs | Ithaca Restructuring Plan      
Restructuring Reserve [Roll Forward]      
Beginning balance 0    
Restructuring cost 1,481,000    
Charges paid/settled (1,468,000)    
Ending balance 13,000 0  
Employee related costs | Design Facility Restructuring Plan      
Restructuring Reserve [Roll Forward]      
Beginning balance 0    
Restructuring cost 338,000    
Charges paid/settled (338,000)    
Ending balance 0 0  
Employee related costs | 2019 Restructuring Plan      
Restructuring Reserve [Roll Forward]      
Beginning balance 0    
Restructuring cost 6,265,000    
Charges paid/settled (4,729,000)    
Ending balance 1,536,000 0  
Facility related expenses      
Restructuring Reserve [Roll Forward]      
Beginning balance 0 0  
Restructuring cost 11,459,000 3,476,000 0
Charges paid/settled (10,481,000) (3,476,000)  
Ending balance 978,000 0 0
Facility related expenses | Long Beach, Belfast and Sydney Restructuring Plan      
Restructuring Reserve [Roll Forward]      
Beginning balance 0 0  
Restructuring cost 0 3,476,000  
Charges paid/settled 0 (3,476,000)  
Ending balance 0 0 $ 0
Facility related expenses | Ithaca Restructuring Plan      
Restructuring Reserve [Roll Forward]      
Beginning balance 0    
Restructuring cost 3,969,000    
Charges paid/settled (3,899,000)    
Ending balance 70,000 0  
Facility related expenses | Design Facility Restructuring Plan      
Restructuring Reserve [Roll Forward]      
Beginning balance 0    
Restructuring cost 2,190,000    
Charges paid/settled (1,739,000)    
Ending balance 451,000 0  
Facility related expenses | 2019 Restructuring Plan      
Restructuring Reserve [Roll Forward]      
Beginning balance 0    
Restructuring cost 5,300,000    
Charges paid/settled (4,843,000)    
Ending balance $ 457,000 $ 0