Subsequent Event (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	12 Months Ended	0 Months Ended	9 Months Ended	12 Months Ended
Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011	Dec. 31, 2012 Subsequent Event [Member] Viking [Member]	Sep. 29, 2012 Subsequent Event [Member] Viking [Member]	Dec. 31, 2011 Subsequent Event [Member] Viking [Member]
Subsequent Event [Line Items]
Payment for acqusition	$ 0	$ 1,603,000	$ 1,621,000	$ 380,000,000
Annual revenues of Viking				200,000,000
Identifiable intangible assets				152,500,000
Goodwill	526,011,000	477,812,000	369,989,000	180,000,000
Net sales	1,074,910,000	1,001,467,000			920,232,000	1,075,278,000
Net earnings	$ 124,167,000	$ 102,304,000			$ 70,217,000	$ 79,665,000
Net earnings per share (usd per share)	$ 6.68	$ 5.52			$ 3.79	$ 4.30
Basic (shares)					18,237	17,998
Diluted (shares)					18,539	18,534

Business Acquisition, Average Revenue Reported by Acquired Entity

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Business Acquisition, Pro Forma, Weighted Average Shares Outstanding, Diluted

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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.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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