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Revenues - Remaining Performance Obligations & Revenue Expected to be recognized (Details)
Sep. 29, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-09-29  
Remaining Performance Obligation, Expected Timing of Satisfaction  
Percentage of remaining performance obligation expected to be recognized in period 62.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-03  
Remaining Performance Obligation, Expected Timing of Satisfaction  
Percentage of remaining performance obligation expected to be recognized in period 22.00%