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Leases - ROU assets and lease liabilities (Detail) - USD ($)
$ in Thousands
Jun. 27, 2020
Dec. 28, 2019
Right-of-use assets    
Operating lease assets $ 61,420 $ 53,758
Finance lease assets 5,814 2,531
Current    
Operating lease liabilities 7,444 5,168
Non-current    
Operating lease liabilities 62,896 53,940
Operating Right Of Use Assets [Member]    
Right-of-use assets    
Operating lease assets 61,420 53,758
Property, Plant and Equipment [Member]    
Right-of-use assets    
Finance lease assets 5,814 2,531
Current Operating Lease Liabilities [Member]    
Current    
Operating lease liabilities 7,444 5,168
Accrued Expenses And Other Current Liabilities [Member]    
Current    
Finance lease liabilities 1,807 546
Non Current Operating Lease Liabilities [Member]    
Non-current    
Operating lease liabilities 62,896 53,940
Other Liabilities [Member]    
Non-current    
Finance lease liabilities $ 4,056 $ 2,042