Goodwill - Narrative (Details) $ in Millions  | 
3 Months Ended | 9 Months Ended | 
|---|---|---|
| 
 Mar. 28, 2020  
reporting_unit 
 | 
 Sep. 26, 2020  
USD ($)  
reporting_unit 
 | 
|
| Goodwill | ||
| Number of reporting units | 8 | |
| Number of reporting units impaired | 4 | 4 | 
| Aerospace Segment | ||
| Goodwill | ||
| Impairment loss | $ | $ 86.3 | 
| X | ||||||||||
- Definition Number Of Reporting Units Impaired No definition available. 
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| X | ||||||||||
- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
- 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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| X | ||||||||||
- Definition Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment. No definition available. 
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| X | ||||||||||
- Details 
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