Summary of Results of Operations for Business Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 29, 2012		Oct. 01, 2011		Sep. 29, 2012		Oct. 01, 2011		Dec. 31, 2011	Jul. 02, 2011
Segment Reporting Information [Line Items]
Net sales	$ 257,699	[1]	$ 218,720	[1]	$ 746,562	[1]	$ 612,147	[1]
Income from operations	47,429	[1]	37,186	[1]	129,427	[1]	103,798	[1]
Depreciation and amortization expense	7,101	[1]	5,334	[1]	20,690	[1]	14,667	[1]
Net capital expenditures	2,866	[1]	1,729	[1]	5,963	[1]	4,880	[1]
Total assets	1,194,002	[1]			1,194,002	[1]			1,146,512	1,030,367	[1]
Long-lived assets	74,203	[1]			74,203	[1]				65,061	[1]
Commercial Foodservice
Segment Reporting Information [Line Items]
Net sales	198,615	[1]	189,133	[1]	573,431	[1]	521,137	[1]
Income from operations	50,105	[1]	47,875	[1]	139,508	[1]	127,118	[1]
Depreciation and amortization expense	4,238	[1]	3,995	[1]	13,445	[1]	11,886	[1]
Net capital expenditures	779	[1]	1,533	[1]	3,108	[1]	4,327	[1]
Total assets	853,582	[1]			853,582	[1]				827,276	[1]
Food Processing
Segment Reporting Information [Line Items]
Net sales	59,084	[1]	29,587	[1]	173,131	[1]	91,010	[1]
Income from operations	7,877	[1]	2,484	[1]	23,755	[1]	13,706	[1]
Depreciation and amortization expense	2,250	[1]	1,106	[1]	6,182	[1]	2,207	[1]
Net capital expenditures	2,029	[1]	23	[1]	2,752	[1]	162	[1]
Total assets	277,129	[1]			277,129	[1]				139,618	[1]
Corporate and Other
Segment Reporting Information [Line Items]
Net sales	0	[1],[2]	0	[1],[2]	0	[1],[2]	0	[1],[2]
Income from operations	(10,553)	[1],[2]	(13,173)	[1],[2]	(33,836)	[1],[2]	(37,026)	[1],[2]
Depreciation and amortization expense	613	[1],[2]	233	[1],[2]	1,063	[1],[2]	574	[1],[2]
Net capital expenditures	58	[1],[2]	173	[1],[2]	103	[1],[2]	391	[1],[2]
Total assets	$ 63,291	[1],[2]			$ 63,291	[1],[2]				$ 63,473	[1],[2]

[1] Non-operating expenses are not allocated to the operating segments. Non-operating expenses consist of interest expense and deferred financing amortization, foreign exchange gains and losses and other income and expense items outside of income from operations.

[2] Includes corporate and other general company assets and operations.