Background and Nature of Operations - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended
	Sep. 28, 2012	Sep. 29, 2012	Dec. 31, 2011	Oct. 01, 2011
Nature Of Business [Line Items]
Shares issued for stock acquisition		231,000,000	98,622,564	98,566,023
Conversion of stock description	At the effective time of the Merger, each Pentair, Inc. common share was converted into the right to receive one of our common shares, resulting in 99,388,463 of our common shares being issued to Pentair, Inc. shareholders.
Common shares being issued as a result of conversion of Pentair, Inc. common share	99,388,463
Tyco Flow Control International, Ltd
Nature Of Business [Line Items]
Percentage of ownership	100.00%
Shares issued for stock acquisition	110,898,934
Goodwill	2,487,552
Pentair, Inc
Nature Of Business [Line Items]
Percentage of ownership	100.00%