Long Term Debt - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended			1 Months Ended		12 Months Ended			12 Months Ended
	May 31, 2011	Jun. 30, 2013 D	Jun. 26, 2011	May 31, 2011 0.50% Notes due 2016	Jun. 30, 2013 0.50% Notes due 2016 D	Jun. 24, 2012 0.50% Notes due 2016	Jun. 30, 2013 0.50% Notes due 2016 Convertible Note Hedge	May 31, 2011 1.25% Convertible Senior Notes Due 2018	Jun. 30, 2013 1.25% Convertible Senior Notes Due 2018 D	Jun. 24, 2012 1.25% Convertible Senior Notes Due 2018	Jun. 30, 2013 1.25% Convertible Senior Notes Due 2018 Convertible Note Hedge	Jun. 24, 2012 2.625% Convertible Senior Notes maturing in 2041	May 31, 2011 2.625% Convertible Senior Notes maturing in 2041	Jun. 30, 2013 2.625% Convertible Senior Notes maturing in 2041 D	Jun. 24, 2012 2.625% Convertible Senior Notes maturing in 2041 Note	Jun. 04, 2012 2.625% Convertible Senior Notes maturing in 2041	Jun. 30, 2013 2.625% Convertible Senior Notes maturing in 2041 On or after May 21, 2021, we may redeem all or part of the 2041 Notes for the principal plus any accrued and unpaid interest D
Debt Instrument [Line Items]
Notes due				$ 450,000,000	$ 450,000,000	$ 450,000,000		$ 450,000,000	$ 450,000,000	$ 450,000,000		$ 699,900,000		$ 699,900,000	$ 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%
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		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					45,700,000	60,300,000			76,900,000	90,400,000		190,300,000		186,900,000	190,300,000
Remaining life of bond discount, years					2 years 10 months 24 days				4 years 10 months 24 days					27 years 10 months 24 days
If-converted value in excess of aggregate principal amount														184,000,000
Percentage of product last reported sale price of common stock					98.00%				98.00%					98.00%
Number of days on which common stock sale price was greater than or equal to 130% of conversion price, in a period of 30 consecutive trading days ending on the last trading day of the immediately preceding fiscal quarter		20			20				20					20			20
Number of consecutive trading days period required		30			30				30					30			30
Stock price percentage of conversion price		130.00%			130.00%				130.00%					130.00%			150.00%
Percentage of principal amounts being repurchased					100.00%				100.00%					100.00%
Warrant conversion price					71.34		71.34		76.10		76.10
Shares issued under warrants					7,100,000				7,100,000
Cost of convertible bond hedge					76,200,000				104,900,000
Convertible bond hedge at inception of the transaction on stockholders' equity					28,200,000				38,800,000
Proceeds from sale of warrants			133,830,000		57,600,000				76,300,000
Shares of common stock agreed to sell									7,100,000
Number of Debt converted to shares of common stock															65
Debt converted, par value															65,000
Debt converted, number of common shares issued															137
Fair value of notes					$ 482,900,000				$ 500,500,000					$ 1,001,600,000