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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. 21, 2018
Dec. 30, 2017
Book value of debt instruments, excluding debt financing costs:    
Current maturities of long-term debt and capital lease obligations $ 7,628 $ 9,196
Long-term debt and capital lease obligations 739,257 747,172
Total book value of debt instruments 746,885 756,368
Fair value of debt instruments, excluding debt financing costs 749,028 757,966
Excess of fair value over book value $ 2,143 $ 1,598