Acquisitions - Purchase Price Allocation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Net Assets Acquired:
Goodwill	$ 151,455	$ 119,051	$ 127,882
Purchase Price:
Cash	58,894	$ 0	12,658
2016 Acquisitions
Net Assets Acquired:
Cash and Cash Equivalents	2,277
Accounts Receivable	5,441
Inventories	3,947
Property, Plant & Equipment	7,179
Other Assets	2,882
Intangibles	24,691
Goodwill	38,552
Total assets acquired	84,969
Accounts Payable	5,536
Customer Deposits	2,471
Capital Lease Obligations	4,842
Long-Term Deferred Income Taxes	6,148
Other Liabilities	6,913
Total Liabilities Assumed	25,910
Net assets acquired	59,059
Purchase Price:
Cash	29,028
Cash Paid to Seller Borrowed Under the Revolving Credit Facility	29,866
Cash Due to Seller	165
Total purchase price	$ 59,059
2014 Acquisitions
Net Assets Acquired:
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
Purchase Price:
Cash			11,840
Contingent Consideration			1,191
Total purchase price			13,031
2014 Acquisitions | Customer relationships
Net Assets Acquired:
Intangibles			4,700
2014 Acquisitions | Intellectual property
Net Assets Acquired:
Intangibles			2,600
2014 Acquisitions | Other
Net Assets Acquired:
Intangibles			$ 360