RESTRUCTURING (Details) (USD $)	3 Months Ended		9 Months Ended
	Oct. 01, 2011	Oct. 02, 2010	Oct. 01, 2011	Oct. 02, 2010
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 553,000	$ 242,000	$ 1,473,000	$ 5,343,000
Water Systems | Phase III | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring expense	300,000		500,000
Water Systems | Phase III | Equipment Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	100,000		100,000
Water Systems | Phase III | Asset write-off
Restructuring Cost and Reserve [Line Items]
Restructuring expense	200,000		900,000
Maximum | Phase IV | Restructuring Costs
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	5,200,000
Maximum | Phase IV | Facility Closing
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	3,500,000
Minimum | Phase IV | Restructuring Costs
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	2,600,000
Minimum | Phase IV | Facility Closing
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	1,200,000
Phase IV | Man Hours Transfer
Restructuring Cost and Reserve [Line Items]
Manufacturing Activity, Man Hours	260,000
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring Reserves	$ 200,000	$ 200,000	$ 200,000	$ 200,000