SEGMENT INFORMATION (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2011	Oct. 02, 2010	Oct. 01, 2011	Oct. 02, 2010	Jan. 01, 2011
Segment Reporting Information
Net sales to external customers	$ 224,391	$ 188,409	$ 633,841	$ 538,820
Operating income (Loss)	28,324	19,601	77,072	50,739
Total assets	844,672		844,672		788,559
Water Systems
Segment Reporting Information
Net sales to external customers	179,400	152,900	510,100	447,200
Operating income (Loss)	29,000	22,500	86,700	66,100
Total assets	551,300		551,300		458,900
Fueling Systems
Segment Reporting Information
Net sales to external customers	45,000	35,500	123,700	91,600
Operating income (Loss)	9,600	6,600	22,200	12,900
Total assets	225,100		225,100		221,100
Other
Segment Reporting Information
Operating income (Loss)	(10,300)	(9,500)	(31,800)	(28,300)
Total assets	$ 68,300		$ 68,300		$ 108,600