Financial Assets and Liabilities that are Measured At Fair Value and are Categorized Using Fair Value Hierarchy (Detail) - Fair Value, Measurements, Recurring - USD ($)	Sep. 26, 2020	Dec. 28, 2019
Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Assets		$ 1,830,000
Financial Liabilities	$ 57,820,000	25,120,000
Contingent Consideration
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Liabilities	10,542,000	6,697,000
Foreign Exchange Forward
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Liabilities	171,000	901,000
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Assets		0
Financial Liabilities	0	0
Fair Value, Inputs, Level 1 [Member] | Contingent Consideration
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Liabilities	0	0
Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Forward
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Liabilities	0	0
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Assets		1,830,000
Financial Liabilities	57,820,000	25,120,000
Fair Value, Inputs, Level 2 [Member] | Contingent Consideration
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Liabilities	0	0
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Forward
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Liabilities	171,000	901,000
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Assets		0
Financial Liabilities	0	0
Fair Value, Inputs, Level 3 [Member] | Contingent Consideration
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Liabilities	10,542,000	6,697,000
Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Forward
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Liabilities	$ 0	$ 0