Acquisitions and Divestitures - Purchase Price of Common Stock and Outstanding Common Stock (Parenthetical) (Detail) (USD $)	1 Months Ended
	Sep. 28, 2012
Business Combination Allocation of Purchase Price [Line Items]
Price per share	$ 43.39
Whole Common Shares [Member]
Business Combination Allocation of Purchase Price [Line Items]
Common shares issued to Tyco shareholders	110,900,000.0
Fractional Shares [Member] | Maximum
Business Combination Allocation of Purchase Price [Line Items]
Common shares issued to Tyco shareholders	100,000