Financing - Additional Information (Detail) (USD $)	9 Months Ended				9 Months Ended					0 Months Ended	3 Months Ended		1 Months Ended	3 Months Ended		0 Months Ended	3 Months Ended		1 Months Ended	0 Months Ended	3 Months Ended		0 Months Ended	3 Months Ended
	May 10, 2014	May 04, 2013	Dec. 31, 2013	Aug. 31, 2013	May 10, 2014 Capital Leases [Member]	Dec. 31, 2013 Capital Leases [Member]	May 10, 2014 Commercial paper, weighted average interest rate of 0.26% and 0.29% at May 10, 2014 and August 31, 2013, respectively [Member]	Aug. 31, 2013 Commercial paper, weighted average interest rate of 0.26% and 0.29% at May 10, 2014 and August 31, 2013, respectively [Member]	Dec. 31, 2013 Letters of Credit [Member]	Jan. 14, 2014 1.300% Senior Notes due January 2017, Effective Interest Rate of 1.43% [Member]	May 10, 2014 1.300% Senior Notes due January 2017, Effective Interest Rate of 1.43% [Member]	Aug. 31, 2013 1.300% Senior Notes due January 2017, Effective Interest Rate of 1.43% [Member]	Jan. 14, 2014 6.500% Senior Notes due January 2014, Effective Interest Rate of 6.63% [Member]	May 10, 2014 6.500% Senior Notes due January 2014, Effective Interest Rate of 6.63% [Member]	Aug. 31, 2013 6.500% Senior Notes due January 2014, Effective Interest Rate of 6.63% [Member]	Apr. 29, 2013 3.125% Senior Notes due July 2023, Effective Interest Rate of 3.26% [Member]	May 10, 2014 3.125% Senior Notes due July 2023, Effective Interest Rate of 3.26% [Member]	Aug. 31, 2013 3.125% Senior Notes due July 2023, Effective Interest Rate of 3.26% [Member]	Apr. 29, 2013 4.375% Senior Notes due June 2013, Effective Interest Rate of 5.65% [Member]	Nov. 13, 2012 2.875% Senior Notes due January 2023, Effective Interest Rate of 3.21% [Member]	May 10, 2014 2.875% Senior Notes due January 2023, Effective Interest Rate of 3.21% [Member]	Aug. 31, 2013 2.875% Senior Notes due January 2023, Effective Interest Rate of 3.21% [Member]	Nov. 13, 2012 5.875% Senior Notes due October 2012 [Member]	May 10, 2014 5.750% Senior Notes due January 2015, Effective Interest Rate of 5.89% [Member]	Aug. 31, 2013 5.750% Senior Notes due January 2015, Effective Interest Rate of 5.89% [Member]
Line of Credit Facility [Line Items]
Total debt	$ 4,378,400,000			$ 4,187,000,000			$ 928,400,000	$ 637,000,000			$ 400,000,000				$ 500,000,000		$ 500,000,000	$ 500,000,000			$ 300,000,000	$ 300,000,000		$ 500,000,000	$ 500,000,000
Senior notes non current																								284,800,000
Stated interest rate percentage										1.30%	1.30%	1.30%	6.50%	6.50%	6.50%	3.125%	3.125%	3.125%	4.375%	2.875%	2.875%	2.875%	5.875%	5.75%	5.75%
Debt instrument, due date										January 2017	January 2017	January 2017	January 2014	January 2014	January 2014	July 2023	July 2023	July 2023	June 2013	January 2023	January 2023	January 2023	October 2012	January 2015	January 2015
Remaining borrowing capacity under revolving credit facility	1,213,000,000
Amount available under credit facility	1,250,000,000		1,250,000,000
Expiration of credit facility	September 2017
Proceeds from issuance of debt	400,000,000	800,000,000								400,000,000						500,000,000				300,000,000
Debt repayment using commercial papers													500,000,000						200,000,000				300,000,000
Letter of credit facility, maximum borrowing capacity			1,500,000,000			175,000,000			200,000,000
Interest accrual on foreign currency loans the basis points					Interest accrues on Eurodollar loans at a defined Eurodollar rate, defined as LIBOR plus the applicable percentage, as defined in the revolving credit facility, depending upon the Company's senior, unsecured, (non-credit enhanced) long-term debt rating.
Fair value of the Company's debt	4,503,000,000			4,259,000,000
Excess (shortfall) of fair value of debt over (from) carrying value	$ 124,900,000			$ 72,200,000