Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Measurement of Assets and Liabilities at Fair Value on Recurring Basis (Details)

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Fair Value Measurements - Measurement of Assets and Liabilities at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 27, 2021
Mar. 28, 2020
Dec. 26, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Business Combination, Contingent Consideration, Liability $ (14,197)   $ (14,197)
Change in fair value of contingent consideration 0 $ (4,400)  
Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Business Combination, Contingent Consideration, Liability 0   0
Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Business Combination, Contingent Consideration, Liability 0   0
Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Business Combination, Contingent Consideration, Liability (14,197)   (14,197)
Fair Value Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading securities 1,448   1,911
Fair Value Measurements, Recurring | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading securities 1,448   1,911
Fair Value Measurements, Recurring | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading securities 0   0
Fair Value Measurements, Recurring | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading securities 0   0
Interest rate swaps | Fair Value Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative liability (3,520)   (4,193)
Interest rate swaps | Fair Value Measurements, Recurring | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative liability 0   0
Interest rate swaps | Fair Value Measurements, Recurring | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative liability (3,520)   (4,193)
Interest rate swaps | Fair Value Measurements, Recurring | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative liability 0   0
Other Current Liabilities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Business Combination, Contingent Consideration, Liability, Current 417   417
Other Noncurrent Liabilities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Business Combination, Contingent Consideration, Liability, Noncurrent $ 13,780   $ 13,780