Basis of Presentation and General Information (Carrying Amounts of Major Classes of Assets and Liabilities Presented in Discontinued Operations) (Details) - USD ($) $ in Thousands	Jun. 28, 2019	Dec. 28, 2018
ASSETS
Assets related to discontinued operations		$ 137
LIABILITIES
Liabilities related to discontinued operations	$ 31	2,300
European REL Working Capital group [Member]
ASSETS
Accounts receivable and unbilled revenue (no allowance as of June 28, 2019 and December 28, 2018)		137
Assets related to discontinued operations		137
LIABILITIES
Accrued expenses and other liabilities	31	2,300
Liabilities related to discontinued operations	$ 31	$ 2,300