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Fair Value Measurements - Schedule of Book Value and Estimated Fair Value of Debt Instruments, Excluding Debt Financing Costs (Detail) - USD ($)
$ in Thousands
Apr. 20, 2019
Dec. 29, 2018
Book value of debt instruments, excluding debt financing costs:    
Current maturities of long-term debt and finance lease liabilities $ 18,006 $ 18,263
Long-term debt and finance lease liabilities 759,678 686,594
Total book value of debt instruments 777,684 704,857
Fair value of debt instruments, excluding debt financing costs 778,671 705,875
Excess of fair value over book value $ 987 $ 1,018