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Acquisitions and Purchase Accounting - Pro Forma Information (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011
Business Combinations [Abstract]
Net sales	$ 1,074,910	$ 1,001,467
Net earnings	$ 124,167	$ 102,304
Basic (usd per share)	$ 6.80	$ 5.68
Diluted (usd per share)	$ 6.68	$ 5.52

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References+ Details

- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References+ Details