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Property Plant and Equipment - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Sep. 29, 2017
Property, Plant and Equipment [Line Items]      
Depreciation and amortization expense $ 29,700 $ 30,700 $ 27,300
Accumulated depreciation 149,187 128,363  
Capital lease assets      
Property, Plant and Equipment [Line Items]      
Accumulated depreciation $ 5,300 $ 3,200