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Nature of Operations and Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			12 Months Ended
	Mar. 30, 2013	Mar. 30, 2013	Mar. 31, 2012	Dec. 29, 2012
Nature of Operations and Summary of Significant Accounting Policies [Abstract]
Number of reportable segments	1	1	1	1
Inventories [Abstract]
Raw Materials and Supplies	$ 20,168	$ 20,168		$ 19,561
Work in Process	9,172	9,172		8,371
Finished Goods	13,009	13,009		14,145
Inventories	42,349	42,349		42,077
Changes in the carrying amount of accrued warranty costs [Roll Forward]
Balance at beginning of period	4,462	4,462	4,129	4,129
Provision		291	228
Usage		(555)	(528)
Currency translation		(79)	63
Balance at end of period	$ 4,119	$ 4,119	$ 3,892	$ 4,462

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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.

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Aggregated amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed. This amount is net of valuation reserves and adjustments.

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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.

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Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

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