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Benefit Plans (Plan Assets Components) (Details) - USD ($) $ in Thousands	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 946	$ 1,358	$ 1,172
Insurance Contract [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	946	1,358
Insurance Contract [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Insurance Contract [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	946	1,358
Insurance Contract [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0

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- Definition

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+ References

No definition available.

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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-Name Accounting Standards Codification
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