Financing Arrangements - Additional Information (Detail) (USD $)			1 Months Ended			1 Months Ended							1 Months Ended		12 Months Ended			1 Months Ended			12 Months Ended
	Apr. 26, 2013	Apr. 27, 2012	Dec. 31, 2012 Revolving Credit Facility Extension	Dec. 21, 2012 Revolving Credit Facility Minimum	Dec. 21, 2012 Revolving Credit Facility Maximum	Dec. 31, 2012 Revolving Credit Facility Maximum Leverage Ratio	Dec. 31, 2012 Revolving Credit Facility Minimum Interest Coverage Ratio	Dec. 31, 2012 Revolving Credit Facility Foreign Currency Sub Facility	Dec. 31, 2012 Revolving Credit Facility Letter Of Credit Sub Facility	Dec. 31, 2012 Revolving Credit Facility Swingline Subfacility	Apr. 26, 2013 Warrant	Apr. 27, 2012 Warrant	Mar. 31, 2012 Convertible Notes Payable	Jun. 10, 2008 Convertible Notes Payable	Apr. 26, 2013 Convertible Notes Payable	Apr. 27, 2012 Convertible Notes Payable	Jun. 10, 2008 Convertible Notes Payable Equity Component	Dec. 12, 2012 Senior Notes due 2017	Dec. 12, 2012 Senior Notes Due 2022	Dec. 12, 2012 Senior Notes	Apr. 26, 2013 Senior Notes
Debt Disclosure [Line Items]
Notes issued, principal amount	$ 2,264,900,000	$ 1,264,900,000												$ 1,265,000,000	$ 1,264,900,000	$ 1,264,900,000		$ 750,000,000	$ 250,000,000
Notes issued, interest rate														1.75%	1.75%			2.00%	3.25%
Notes issued, maturity date															Jun. 01, 2013			Dec. 15, 2017	Dec. 15, 2022
Notes issued, issuance discount	12,500,000	62,600,000												248,000,000	7,100,000	62,600,000				5,800,000
Notes issued, issuance costs																				6,900,000
Interest expense																					9,400,000
Note repurchase price, percentage of principal amount of notes																					101.00%
Numerator of common stock ratio for convertible notes															31.40
Denominator of principal amount upon which conversion rate is based															1,000
Conversion price of notes to shares of common stock	$ 31.85														$ 31.85
Trading price of convertible notes during measurement period, percentage															130.00%
Convertible notes, number of trading days during the 30 consecutive trading days ended March 31, 2012 during which common stock price did not exceed the conversion threshold price													20 days
The number of consecutive trading days ending on the last trading day of each calendar quarter that is used in the determination of whether the Convertible Notes are contingently convertible													30 days
Closing price of common stock															34.87
If converted value of the Convertible notes exceeded over Principal															120,100,000
Convertible Notes														1,017,000,000
Effective interest rate														6.31%	6.31%	6.31%
Issuance costs on Convertible Notes														21,400,000			5,200,000
Equity component of Convertible Notes	0	62,600,000													244,900,000	244,900,000
Convertible Note Hedge number of shares contracted to sell	31,800,000	31,800,000
Convertible Note Hedge Exercise Price	$ 31.85	$ 31.85
Outstanding warrants, number of shares											39,700,000	39,700,000
Exercise price of warrants											41.28	41.28
Unhedged portion of notes															20.00%
Credit facility, amount			250,000,000					100,000,000	50,000,000	10,000,000
Credit facility, term			5 years
Credit facility, increase in facility			$ 100,000,000
Credit facility, number of extensions			2
Credit facility, extensions period			1 year
Credit facility, base rate				0.20%	1.20%
Credit facility, date terminate			Dec. 21, 2017
Covenant Terms						3.0 :1.0	3.5: 1.0