Legal Proceedings Legal Proceedings (Details) - Germany - Lufthansa Technik AG $ in Millions  | 
3 Months Ended | 
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| 
 Apr. 01, 2017  
USD ($)  
product 
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| Loss Contingencies [Line Items] | |
| Number of products in distribution channels | product | 0 | 
| Patent Infringement | |
| Loss Contingencies [Line Items] | |
| Appeal process duration (in years, up to) | 2 years | 
| Patent Infringement | AES | Minimum | |
| Loss Contingencies [Line Items] | |
| Estimate of the value of the dispute | $ 1 | 
| Patent Infringement | AES | Maximum | |
| Loss Contingencies [Line Items] | |
| Estimate of the value of the dispute | $ 3 | 
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- Definition Loss Contingency, Pending Claims, Period for Appeal No definition available. 
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- Definition Number of Products in Distribution Channels No definition available. 
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- Definition 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. 
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- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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