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Leases - Assets Held Under Capital Leases (Detail) - USD ($)
$ in Thousands
Dec. 30, 2017
Dec. 31, 2016
Capital Leased Assets [Line Items]    
Assets under capital leases $ 64,125 $ 65,234
Less accumulated amortization and depreciation 29,518 25,163
Net assets under capital leases 34,607 40,071
Buildings and Improvements [Member]    
Capital Leased Assets [Line Items]    
Assets under capital leases 60,398 61,831
Equipment [Member]    
Capital Leased Assets [Line Items]    
Assets under capital leases $ 3,727 $ 3,403