Fair Value Measurements Non-Recurring Fair Value Measurements (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	Sep. 27, 2020	Dec. 29, 2019
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis
Assets Held and used, Long Lived, Fair Value Disclosure	$ 304	$ 3,582
Assets Held for sale, Long Lived, Fair Value Disclosure	1,417	988
Total	1,721	4,570
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis
Assets Held and used, Long Lived, Fair Value Disclosure	0	0
Assets Held for sale, Long Lived, Fair Value Disclosure	0	0
Total	0	0
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis
Assets Held and used, Long Lived, Fair Value Disclosure	0	0
Assets Held for sale, Long Lived, Fair Value Disclosure	0	0
Total	0	0
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis
Assets Held and used, Long Lived, Fair Value Disclosure	304	3,582
Assets Held for sale, Long Lived, Fair Value Disclosure	1,417	988
Total	$ 1,721	$ 4,570