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Business Combinations - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Apr. 15, 2019
Aug. 31, 2020
Sep. 25, 2020
Sep. 27, 2019
Jun. 26, 2020
Sep. 25, 2020
Sep. 27, 2019
Dec. 27, 2019
Business Acquisition [Line Items]                
Amortization of purchased intangible assets     $ 4.9 $ 5.1   $ 14.8 $ 15.0  
Dynamic Manufacturing Solutions [Member]                
Business Acquisition [Line Items]                
Date of acquisition Apr. 15, 2019              
Business acquisition potential cash earn-out payments $ 12.5              
Business acquisition fair value of potential earn-out payments 1.5       $ 1.5      
Total purchase consideration 31.4              
Cash payment for acquisition $ 29.9              
Earn-out payments, fair market value   $ 12.5           $ 9.5
Increase in liability recorded as other expense           3.0    
Amortization of purchased intangible assets     $ 0.3 $ 0.3   $ 0.9 $ 0.5