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Acquisitions - Purchase Price Allocation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Business Acquisition [Line Items]
Goodwill	$ 127,882us-gaap_Goodwill	$ 131,915us-gaap_Goodwill	$ 107,947us-gaap_Goodwill
Cash	12,658	67,453	0
2014 Acquisitions
Business Acquisition [Line Items]
Cash and cash equivalents	674
Inventories	1,064
Other current assets	324
Property, plant & equipment	847
Goodwill	3,463
Total assets acquired	14,032
Total liabilities assumed	1,001
Net assets acquired	13,031
Cash	11,840
Contingent consideration	1,191
Total purchase price	13,031
2014 Acquisitions \| Customer relationships
Business Acquisition [Line Items]
Identifiable intangible assets acquired	4,700
2014 Acquisitions \| Intellectual property
Business Acquisition [Line Items]
Identifiable intangible assets acquired	2,600
2014 Acquisitions \| Other
Business Acquisition [Line Items]
Identifiable intangible assets acquired	360
2013 Acquisitions
Business Acquisition [Line Items]
Cash and cash equivalents		1,966
Inventories		17,757
Property, plant & equipment		5,891
Accounts receivable		8,523
Other assets		3,237
Goodwill		24,744
Total assets acquired		89,137
Long-term deferred tax liabilities		6,032
Other liabilities		14,834
Total liabilities assumed		20,866
Net assets acquired		68,271
Cash		68,271
2013 Acquisitions \| Customer relationships
Business Acquisition [Line Items]
Identifiable intangible assets acquired		5,340
2013 Acquisitions \| Intellectual property
Business Acquisition [Line Items]
Identifiable intangible assets acquired		18,786
2013 Acquisitions \| Other
Business Acquisition [Line Items]
Identifiable intangible assets acquired		$ 2,893