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Customer Prepayments	6 Months Ended
Customer Prepayments	Jun. 26, 2020
Customer Prepayments [Abstract]
Customer Prepayments Investment Agreement [Text Block]	Customer Prepayments The Company entered into an investment agreement with a customer to procure equipment to manufacture product for the customer. The customer will make prepayments to the Company in the amount of approximately $70 million in the aggregate to enable the Company to purchase and install certain equipment and make necessary infrastructure improvements to supply product to the customer. The Company will own the equipment and be responsible for operating and maintenance costs. The prepayment from the customer will be applied when commercial production of the product is sold and delivered to the customer in connection with a master supply agreement. Accordingly, $31.4 million of prepayments are classified as Unearned Income in the Consolidated Balance Sheet, of which $19.6 million were received during the second quarter of 2020, and the liability is expected to be settled as commercial shipments are made.