Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value Measurements Recurring - USD ($) $ in Thousands	Sep. 29, 2019	Dec. 30, 2018
Level 1
Schedule of Assets Measured at Fair Value on a Recurring Basis
Assets held in trust	$ 2,574	$ 2,465
Level 1 | Cash and Cash Equivalents (as Held in the Trust)
Schedule of Assets Measured at Fair Value on a Recurring Basis
Assets held in trust	183	86
Level 1 | Corporate Bonds (as Held in the Trust)
Schedule of Assets Measured at Fair Value on a Recurring Basis
Assets held in trust	2,091	2,083
Level 1 | U.S. Government Obligations (as Held in the Trust)
Schedule of Assets Measured at Fair Value on a Recurring Basis
Assets held in trust	300	296
Level 2
Schedule of Assets Measured at Fair Value on a Recurring Basis
Assets held in trust	2,196	2,193
Level 2 | Cash Surrender Value - Life Insurance (as Held in the Trust)
Schedule of Assets Measured at Fair Value on a Recurring Basis
Assets held in trust	$ 2,196	$ 2,193