Condensed Consolidated Statements of Income and Comprehensive Income (Loss) (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jul. 02, 2011	Jun. 30, 2012	Jul. 02, 2011
Net sales	$ 941,525	$ 910,175	$ 1,799,702	$ 1,700,448
Cost of goods sold	629,397	622,439	1,206,855	1,163,653
Gross profit	312,128	287,736	592,847	536,795
Selling, general and administrative	173,445	158,432	348,455	303,192
Research and development	20,891	19,882	41,648	38,004
Operating income	117,792	109,422	202,744	195,599
Other (income) expense:
Equity income of unconsolidated subsidiaries	(636)	(672)	(1,685)	(907)
Net interest expense	16,079	14,613	30,847	23,938
Income before income taxes and noncontrolling interest	102,349	95,481	173,582	172,568
Provision for income taxes	28,864	27,344	37,943	52,397
Net income before noncontrolling interest	73,485	68,137	135,639	120,171
Noncontrolling interest	1,655	1,425	2,995	2,918
Net income attributable to Pentair, Inc.	71,830	66,712	132,644	117,253
Comprehensive income (loss)	(10,430)	92,306	93,808	187,119
Less: Comprehensive income (loss) attributable to noncontrolling interest	(223)	2,216	2,020	5,621
Comprehensive income (loss) attributable to Pentair, Inc.	$ (10,207)	$ 90,090	$ 91,788	$ 181,498
Earnings per common share attributable to Pentair, Inc.
Basic	$ 0.73	$ 0.68	$ 1.34	$ 1.19
Diluted	$ 0.71	$ 0.67	$ 1.32	$ 1.17
Weighted average common shares outstanding
Basic	99,047	98,333	98,856	98,190
Diluted	101,165	100,065	100,785	99,825
Cash dividends declared per common share	$ 0.22	$ 0.20	$ 0.44	$ 0.40