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Related Party Agreements (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
Related Party Agreements (Details) - USD ($) $ in Thousands	Sep. 28, 2018	Jun. 29, 2018	Jun. 29, 2018
Founder and Minority Stockholder \| Related Party Transactions
Related Party Transaction [Line Items]
Payments made under lease		$ 179	$ 358
Beneficial Owner \| Purchase of Properties \| Employees
Related Party Transaction [Line Items]
Amount of related party transaction	$ 3,750
Beneficial Owner \| Rental of Buildings \| Employees
Related Party Transaction [Line Items]
Expenses from transactions with related party		$ 86	$ 171