| Contract Liabilities (Tables) | 6 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Jun. 26, 2021 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Revenue from Contract with Customer [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Contract with Customer, Asset and Liability [Table Text Block] | The following table shows the changes in contract liability balances relating to long-term prepaid supply agreements during the first six months of 2021: 
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| X | ||||||||||
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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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- References No definition available. 
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