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Summary of Significant Accounting Policies (Inventories) (Details) - USD ($)	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Accounting Policies [Abstract]
Percentage of LIFO inventory	83.00%	79.00%
Inventory, Net [Abstract]
Finished products	$ 101,715,000	$ 71,223,000
Materials and work in process	81,202,000	71,375,000
LIFO allowance	(27,234,000)	(24,160,000)
Inventories, net	155,683,000	118,438,000
Effect of LIFO inventory, decrease (increase) in cost of goods sold	$ 0	$ 50,000	$ 0

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The effect of liquidating LIFO (last in first out) inventory layers on income.

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods.

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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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The aggregate carrying amount as of the balance sheet date of items held by the entity which are partially completed at the time of measurement and unprocessed items that will go through the production process and become part of the final product. Includes supplies used directly or indirectly in the manufacturing or production process. This element may be used when the reporting entity combines work in process and raw materials into an aggregate amount.

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The percentage of LIFO (last in first out) inventory to total inventory as of the balance sheet date if other than 100 percent.

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