Inventories (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Finished product	$ 171,277	$ 156,542
Work in process	101,540	87,284
Inventory, Raw Materials, Net of Reserves	33,173	39,859
Supplies and other	52,193	47,130
Inventories	$ 358,183	$ 330,815

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

+ References

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-Publisher FASB
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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

+ References

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-Publisher FASB
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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

+ References

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Amount, after of valuation reserves and allowances, of inventory, classified as other, expected to be sold, or consumed within one year or operating cycle, if longer.

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