Significant Accounting Policies (Narrative) (Details) $ in Thousands	12 Months Ended
	Jan. 01, 2016 USD ($) segment	Jan. 02, 2015 USD ($)	Jan. 03, 2014 USD ($)
Significant Accounting Policies [Line Items]
Deferred compensation investments	$ 9,855	$ 11,144
Gain on deferred compensation investments, net	300	500	$ 1,500
Deferred Compensation expense	100	700	1,700
Advertising expense	$ 4,500	4,200	3,400
Percentage of grants vesting in first year	25.00%
Cumulative translation adjustments in AOCI	$ 300	900	2,700
Number of reportable segments | segment	1
Deferred Stock Units [Member]
Significant Accounting Policies [Line Items]
Expected life for amortization of grant date fair value (in years)	3 years
Restricted Stock Units (RSUs) [Member]
Significant Accounting Policies [Line Items]
Expected life for amortization of grant date fair value (in years)	4 years
Employee Stock Purchase Plan [Member]
Significant Accounting Policies [Line Items]
Percentage of stock market price paid by employees on date of purchase	85.00%
Options [Member]
Significant Accounting Policies [Line Items]
Options contract period (in years)	7 years
Options [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Options contract period (in years)	4 years
Options [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Options contract period (in years)	3 years
Foreign Pension Plan [Member]
Significant Accounting Policies [Line Items]
Accrued liabilities relating to unfunded plans	$ 7,800	6,800
Retirement plans expense	$ 900	800	3,600
Pension Plan [Member]
Significant Accounting Policies [Line Items]
Vesting period	5 years
Retirement plans expense	$ 4,800	$ 4,500	$ 5,400
Buildings And Leasehold Improvements [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	30 years
Buildings And Leasehold Improvements [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Machinery and Equipment [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	8 years
Machinery and Equipment [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	3 years