Long Term Debt - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended		1 Months Ended	3 Months Ended	12 Months Ended			1 Months Ended	3 Months Ended	12 Months Ended			1 Months Ended		3 Months Ended	12 Months Ended
	May 31, 2011	Sep. 29, 2013 D	Jun. 30, 2013 D	May 31, 2011 0.50% Notes due 2016	Sep. 29, 2013 0.50% Notes due 2016	Jun. 24, 2012 0.50% Notes due 2016	Jun. 30, 2013 0.50% Notes due 2016	Sep. 29, 2013 0.50% Notes due 2016 Convertible Note Hedge	May 31, 2011 1.25% Notes due 2018	Sep. 29, 2013 1.25% Notes due 2018	Jun. 24, 2012 1.25% Notes due 2018	Jun. 30, 2013 1.25% Notes due 2018	Sep. 29, 2013 1.25% Notes due 2018 Convertible Note Hedge	Jun. 24, 2012 2.625% Notes due 2041	May 31, 2011 2.625% Notes due 2041	Sep. 29, 2013 2.625% Notes due 2041	Jun. 24, 2012 2.625% Notes due 2041	Jun. 30, 2013 2.625% Notes due 2041	Jun. 04, 2012 2.625% Notes due 2041
Debt Instrument [Line Items]
Notes due				$ 450,000,000	$ 450,000,000		$ 450,000,000		$ 450,000,000	$ 450,000,000		$ 450,000,000		$ 700,000,000		$ 699,900,000	$ 700,000,000	$ 699,900,000
Convertible notes interest rate percentage				0.50%	0.50%		0.50%		1.25%	1.25%		1.25%		2.625%		2.625%	2.625%	2.625%
Initial conversion rate of common stock shares				15.8687					15.8687					28.4781
Convertible Senior Notes conversion price				$ 63.02	$ 63.02				$ 63.02	$ 63.02				$ 35.11			$ 35.11
Principal amount of convertible debt conversion increments				1,000										1,000			1,000
Net proceeds from the sale of Convertible Senior Notes	835,500,000
Debt instruments maturity date					2016					2018						2041
Maximum amount of contingent interest rate																2.10%
Initial carrying value of liability component of convertible notes				373,800,000					345,100,000										509,500,000
Discount rate used to determine liability fair value				4.29%	4.29%	4.29%			5.27%	5.27%	5.27%				4.28%	4.28%	4.28%
Carrying value of equity components					76,200,000					104,900,000	104,900,000					328,100,000
Effective interest rates on the liability component					4.29%					5.27%						4.28%
Unamortized discount balance					42,000,000		45,700,000			73,400,000		76,900,000				186,000,000		186,900,000
Remaining life of bond discount, years					2 years 7 months 6 days					4 years 7 months 6 days						27 years 7 months 6 days
If-converted value in excess of aggregate principal amount																320,000,000
Warrant conversion price					71.34			71.34		76.10			76.10
Shares issued under warrants					7.1					7.1
Shares of common stock agreed to sell					7.1					7.1
Period of time that common stock sale price for preceding quarter exceeds conversion price		20	20
Number of consecutive trading days period required		30	30
Stock price percentage of conversion price		130.00%	130.00%
Fair value of notes					$ 516,400,000					$ 544,500,000						$ 1,110,600,000