SEGMENT AND GEOGRAPHIC INFORMATION (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Jan. 01, 2011	Oct. 02, 2010	Jul. 03, 2010	Apr. 03, 2010	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Segment Reporting Information
Net sales to external customers	$ 187,200,000	$ 224,400,000	$ 224,100,000	$ 185,400,000	$ 175,000,000	$ 188,400,000	$ 190,400,000	$ 160,000,000	$ 821,077,000	$ 713,792,000	$ 625,991,000
Long-Lived Assets	429,000,000				409,400,000				429,000,000	409,400,000
Operating income (Loss)									93,398,000	63,999,000	43,731,000
Total assets	829,530,000				788,559,000				829,530,000	788,559,000
Depreciation									19,400,000	19,500,000	20,200,000
Amortization									5,900,000	4,600,000	5,100,000
Captial expenditures									21,100,000	12,800,000	13,900,000
Water Systems
Segment Reporting Information
Net sales to external customers									654,100,000	583,300,000	504,800,000
Operating income (Loss)									105,300,000	84,000,000	55,900,000
Total assets	535,300,000				458,900,000				535,300,000	458,900,000
Depreciation									15,200,000	16,200,000	17,600,000
Amortization									4,200,000	3,200,000	3,300,000
Captial expenditures									13,800,000	10,800,000	9,500,000
Fueling Systems
Segment Reporting Information
Net sales to external customers									167,000,000	130,500,000	121,200,000
Operating income (Loss)									31,300,000	17,400,000	20,900,000
Total assets	222,200,000				221,100,000				222,200,000	221,100,000
Depreciation									1,800,000	1,400,000	1,200,000
Amortization									1,700,000	1,400,000	1,800,000
Captial expenditures									1,800,000	100,000	300,000
Other
Segment Reporting Information
Net sales to external customers									0	0	0
Operating income (Loss)									(43,200,000)	(37,400,000)	(33,100,000)
Total assets	72,000,000				108,600,000				72,000,000	108,600,000
Depreciation									2,400,000	1,900,000	1,400,000
Amortization									0	0	0
Captial expenditures									5,500,000	1,900,000	4,100,000
United States
Segment Reporting Information
Net sales to external customers									371,000,000	319,900,000	279,000,000
Long-Lived Assets	257,000,000				258,500,000				257,000,000	258,500,000
Foreign
Segment Reporting Information
Net sales to external customers									450,100,000	393,900,000	347,000,000
Long-Lived Assets	$ 172,000,000				$ 150,900,000				$ 172,000,000	$ 150,900,000