Nature of Operations and Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Goodwill [Roll Forward]
Gross Balance, Beginning Balance	$ 213,391	$ 217,424
Accumulated Impairment Losses	(85,509)	(85,509)	$ (85,509)
Net Balance, Beginning Balance	127,882	131,915
Increase due to acquisitions		4,182
Currency translation adjustment	(8,831)	(8,215)
Goodwill period adjustments	(8,831)	(4,033)
Gross Balance, Ending Balance	204,560	213,391
Accumulated Impairment Losses	(85,509)	(85,509)	(85,509)
Net Balance, Ending Balance	119,051	127,882
Stock-Preparation
Goodwill [Roll Forward]
Net Balance, Beginning Balance	20,081
Net Balance, Ending Balance	19,527	20,081
Doctoring, Cleaning, & Filtration
Goodwill [Roll Forward]
Net Balance, Beginning Balance	38,381
Net Balance, Ending Balance	35,990	38,381
Fluid-Handling
Goodwill [Roll Forward]
Net Balance, Beginning Balance	49,308
Net Balance, Ending Balance	46,694	49,308
Operating Segments | Papermaking systems segment
Goodwill [Roll Forward]
Gross Balance, Beginning Balance	193,279	196,339
Accumulated Impairment Losses	(85,509)	(85,509)	(85,509)
Net Balance, Beginning Balance	107,770	110,830
Increase due to acquisitions		3,288
Currency translation adjustment	(5,559)	(6,348)
Goodwill period adjustments	(5,559)	(3,060)
Gross Balance, Ending Balance	187,720	193,279
Accumulated Impairment Losses	(85,509)	(85,509)	(85,509)
Net Balance, Ending Balance	102,211	107,770
Operating Segments | Wood Processing Systems
Goodwill [Roll Forward]
Gross Balance, Beginning Balance	20,112	21,085
Accumulated Impairment Losses	0	0	0
Net Balance, Beginning Balance	20,112	21,085
Increase due to acquisitions		894
Currency translation adjustment	(3,272)	(1,867)
Goodwill period adjustments	(3,272)	(973)
Gross Balance, Ending Balance	16,840	20,112
Accumulated Impairment Losses	0	0	$ 0
Net Balance, Ending Balance	$ 16,840	$ 20,112