Purchase Price of Common Stock and Outstanding Common Stock (Detail) (Tyco Flow Control International, Ltd, USD $) In Thousands, unless otherwise specified	1 Months Ended
	Sep. 28, 2012
Tyco Flow Control International, Ltd
Business Combination Allocation of Purchase Price [Line Items]
Value of common shares issued to Tyco shareholders	$ 4,811,363	[1]
Cash paid to Tyco shareholders in lieu of fractional common shares	542	[2]
Value of replacement equity-based awards to holders of Tyco equity-based awards	92,349	[3]
Purchase Price	$ 4,904,254

[1] Equals 110,886,444 Pentair Ltd. shares distributed to Tyco shareholders multiplied by the Merger date share price of $43.39.

[2] Equals cash paid to Tyco shareholders in lieu of 12,490 Pentair Ltd. fractional shares multiplied by the Merger date share price of $43.39.

[3] In accordance with applicable accounting guidance, the fair value of replacement equity-based awards attributable to pre-combination service is recorded as part of the consideration transferred in the Merger, while the fair value of replacement equity-based awards attributable to post-combination service is recorded separately from the business combination and recognized as compensation cost in the post-acquisition period over the remaining service period. The fair value of our equivalent stock options was estimated using the Black-Scholes valuation model utilizing various assumptions.