Revenues - Remaining Performance Obligations & Revenue Expected to be recognized (Details)	Dec. 29, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-02
Remaining Performance Obligation, Expected Timing of Satisfaction
Percentage of remaining performance obligation expected to be recognized in period	75.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-12-31
Remaining Performance Obligation, Expected Timing of Satisfaction
Percentage of remaining performance obligation expected to be recognized in period	14.00%

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