SEGMENT AND GEOGRAPHIC INFORMATION (Details) (USD $)	3 Months Ended								12 Months Ended
	Jan. 03, 2015	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Segment Reporting Information
Net sales to external customers	$ 253,800,000	$ 278,100,000	$ 284,500,000	$ 231,400,000	$ 229,800,000	$ 249,800,000	$ 263,400,000	$ 222,500,000	$ 1,047,777,000	$ 965,462,000	$ 891,345,000
Operating income (loss)									100,088,000	123,781,000	112,957,000
Total assets	1,075,887,000				1,051,873,000				1,075,887,000	1,051,873,000
Depreciation									28,100,000	23,400,000	21,100,000
Amortization									9,100,000	8,000,000	7,200,000
Capital expenditures									42,400,000	67,200,000	42,100,000
Long-lived assets	602,400,000				576,500,000				602,400,000	576,500,000
Water Systems
Segment Reporting Information
Net sales to external customers									824,600,000	766,400,000	715,000,000
Operating income (loss)									103,900,000	131,300,000	124,100,000
Total assets	757,500,000				714,700,000				757,500,000	714,700,000
Depreciation									19,900,000	18,100,000	16,900,000
Amortization									7,100,000	6,000,000	5,700,000
Capital expenditures									33,800,000	31,000,000	25,200,000
Fueling Systems
Segment Reporting Information
Net sales to external customers									223,200,000	199,100,000	176,300,000
Operating income (loss)									49,700,000	42,600,000	36,600,000
Total assets	252,700,000				247,900,000				252,700,000	247,900,000
Depreciation									2,400,000	1,900,000	1,800,000
Amortization									1,800,000	1,900,000	1,500,000
Capital expenditures									3,900,000	4,000,000	3,300,000
Other
Segment Reporting Information
Net sales to external customers									0	0	0
Operating income (loss)									(53,500,000)	(50,100,000)	(47,700,000)
Total assets	65,700,000				89,300,000				65,700,000	89,300,000
Depreciation									5,800,000	3,400,000	2,400,000
Amortization									200,000	100,000	0
Capital expenditures									4,700,000	32,200,000	13,600,000
United States
Segment Reporting Information
Net sales to external customers									485,500,000	460,500,000	428,500,000
Long-lived assets	418,000,000				377,300,000				418,000,000	377,300,000
Foreign
Segment Reporting Information
Net sales to external customers									562,300,000	505,000,000	462,800,000
Long-lived assets	$ 184,400,000				$ 199,200,000				$ 184,400,000	$ 199,200,000
Credit Concentration Risk
Segment Reporting Information
Concentration risk, customer									0	0
Concentration risk, percentage									10.00%
Customer Concentration Risk
Segment Reporting Information
Concentration risk, customer									0	0	0
Concentration risk, percentage									10.00%