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Carrying Amounts and Fair Values of Certain Assets (Detail) - USD ($)
$ in Thousands
Mar. 24, 2019
Dec. 30, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents, carrying amount $ 48,467 $ 11,877
Restricted cash equivalents, carrying amount 90,014 112,272
Investments in marketable securities, carrying amount 10,187 8,718
Advertising fund cash equivalents, restricted, carrying amount 22,847 31,547
Advertising fund investments, restricted, carrying amount 50,152 50,152
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents, carrying amount 48,467 11,877
Restricted cash equivalents, carrying amount 90,014 112,272
Investments in marketable securities, carrying amount 10,187 8,718
Advertising fund cash equivalents, restricted, fair value 22,847 31,547
Advertising fund investments, restricted, fair value $ 50,152 $ 50,152