Revenue - Revenue Performance Obligations (Percentage and Remaining Period of Time) (Details)
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Sep. 28, 2018 |
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-09-29 |
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| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
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| Revenue, remaining performance obligation, percentage |
39.00%
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| Revenue,expected performance obligation, period |
3 months
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| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 |
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| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
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| Revenue, remaining performance obligation, percentage |
61.00%
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| Revenue,expected performance obligation, period |
1 year
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