The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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GOODWILL AND INTANGIBLE ASSETS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Mar. 30, 2013	Mar. 31, 2012	Dec. 29, 2012	Mar. 30, 2013 Customer Relationships	Dec. 29, 2012 Customer Relationships	Mar. 30, 2013 Proprietary Software and Database	Dec. 29, 2012 Proprietary Software and Database	Mar. 30, 2013 Patents and Proprietary Technology	Dec. 29, 2012 Patents and Proprietary Technology	Mar. 30, 2013 Non-compete Agreements	Dec. 29, 2012 Non-compete Agreements
Components of amortized intangible assets
Gross Carrying Amount	$ 187,877		$ 185,389	$ 173,409	$ 170,556	$ 3,078	$ 3,073	$ 9,591	$ 9,953	$ 1,799	$ 1,807
Accumulated Amortization	75,782		72,811	65,701	62,957	2,820	2,795	5,701	5,517	1,560	1,542
Weighted Average Life				13 years	13 years	6 years	6 years	8 years	8 years	6 years	6 years
Amortization expense for intangible assets	4,238	3,545
Estimated amortization expense
2013	15,673
2014	15,045
2015	14,202
2016	13,659
2017	$ 13,626