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Pro Forma Consolidated Condensed Financial Results of Operations (Detail) (CPT, USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 29, 2012
Oct. 01, 2011
Sep. 29, 2012
Oct. 01, 2011
CPT
       
Business Acquisition [Line Items]        
Pro forma net sales $ 1,887,325 $ 1,973,995 $ 5,668,620 $ 5,534,956
Pro forma net income attributable to Pentair Ltd. $ 80,650 $ 69,172 $ 230,970 $ 168,458
Diluted earnings per common share attributable to Pentair Ltd. $ 0.38 $ 0.33 $ 1.09 $ 0.80