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Schedule of Highest and Lowest Outstanding Balance Under Credit Facility (Detail) - Unsecured Credit Facility - USD ($)
$ in Thousands
Dec. 28, 2019
Dec. 29, 2018
Debt Instrument [Line Items]    
Unsecured credit facility $ 41,750 $ 0
Maximum    
Debt Instrument [Line Items]    
Unsecured credit facility $ 122,200