Revenues - Remaining Performance Obligations & Revenue Expected to be recognized (Details)	Mar. 30, 2019
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	70.00%
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	23.00%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration