Update to Significant Accounting Policies - Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 28, 2020	Dec. 29, 2019
Carrying Value
Measurement of financial assets and liabilities at fair value on a recurring basis
Cash surrender value of life insurance policies	$ 32,155	$ 33,220
Interest rate swap liabilities	17,050	6,168
Measured on Recurring Basis | Level 1
Measurement of financial assets and liabilities at fair value on a recurring basis
Cash surrender value of life insurance policies	32,155	33,220
Measured on Recurring Basis | Level 2
Measurement of financial assets and liabilities at fair value on a recurring basis
Interest rate swap liabilities	$ 17,050	$ 6,168