Summary of Capped Call (Equity Options) Issued (Detail) - USD ($)		1 Months Ended			2 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Feb. 10, 2015	Apr. 30, 2015	Dec. 31, 2013	Nov. 30, 2010	Sep. 30, 2015	Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014	Dec. 28, 2013	Jan. 03, 2015
Option Indexed to Issuer's Equity [Line Items]
Option Indexed to Issuer's Equity, Settlement Alternatives, Shares, at Fair Value	911,077					1,692,778		1,692,778
Long-term Debt						$ 4,230,500,000		$ 4,230,500,000			$ 4,323,800,000
Convertible Preferred Stock Shares Issuable Upon Conversion										6,100,000
Net Premium Paid			$ 9,700,000
Common Stock, Par or Stated Value Per Share						$ 2.50		$ 2.50			$ 2.50
Payments for Repurchase of Common Stock	$ 326,100,000	$ 100,000,000			$ 191,400,000	$ 192,100,000	$ 1,300,000	$ 640,100,000	$ 20,700,000
Common Stock, Shares, Issued						176,906,265		176,906,265			176,906,265
Stock Exercise Price Per Share Percentage Greater Than Closing Price											$ 0.4
Treasury Stock Acquired, Average Cost Per Share	$ 96.46	$ 101.65			$ 98.89	$ 103.97		$ 112.76
Call Option [Member]
Option Indexed to Issuer's Equity [Line Items]
Original Number of Options	9,100,000.0									12,200,000.0
Option Indexed to Issuer's Equity, Aggregate Fair Value						$ 32,800,000		$ 32,800,000
Minimum [Member]
Option Indexed to Issuer's Equity [Line Items]
Common Stock, Shares, Issued											3,500,000
Stock Exercise Price Per Share											$ 98.80
Maximum [Member]
Option Indexed to Issuer's Equity [Line Items]
Common Stock, Shares, Issued											4,300,000
Stock Exercise Price Per Share											$ 112.91
Call Option [Member]
Option Indexed to Issuer's Equity [Line Items]
Net Premium Paid				$ 50,300,000
Common Stock Price Per Share				$ 5.97						$ 2.77
Open Option Contracts Written, at Fair Value						$ 17,000,000		$ 17,000,000
Notes 2 Point 25 Percent due 2018 [Member]
Option Indexed to Issuer's Equity [Line Items]
Long-term Debt											$ 345,000,000
Common Stock, Par or Stated Value Per Share											$ 100.00
Convertible Notes Payable Four Point Two Five Percent Due Twenty Eighteen [Member]
Option Indexed to Issuer's Equity [Line Items]
Long-term Debt				$ 632,500,000
Common Stock [Member]
Option Indexed to Issuer's Equity [Line Items]
Equity Units Conversion Rate Number Of Common Stock Shares								1.0136
Conversion price of convertible note (in dollars per share)						$ 98.66		$ 98.66
Common Stock [Member] | Minimum [Member]
Option Indexed to Issuer's Equity [Line Items]
Equity Units Conversion Rate Number Of Common Stock Shares										1.0122
Payments for Repurchase of Common Stock										$ 98.80
Common Stock [Member] | Maximum [Member]
Option Indexed to Issuer's Equity [Line Items]
Equity Units Conversion Rate Number Of Common Stock Shares										1.2399
Payments for Repurchase of Common Stock										$ 80.65
Convertible Preferred Stock [Member]
Option Indexed to Issuer's Equity [Line Items]
Conversion price of convertible note (in dollars per share)				$ 75.00		$ 72.66		$ 72.66
Convertible Notes Conversion Rate Number Of Common Stock Shares				1.3333		1.3763		1.3763
Conversion of Stock, Shares Issued				8,433,123						3,500,000.0