Financing - Schedule of Long-term Debt (Parenthetical) (Detail)	Feb. 15, 2014 Commercial paper, weighted average interest rate of 0.25% and 0.29% at February 15, 2014 and August 31, 2013, respectively [Member]	Aug. 31, 2013 Commercial paper, weighted average interest rate of 0.25% and 0.29% at February 15, 2014 and August 31, 2013, respectively [Member]	Feb. 15, 2014 6.500% Senior Notes due January 2014, Effective Interest Rate of 6.63% [Member]	Jan. 14, 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]	Feb. 15, 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]	Feb. 15, 2014 5.500% Senior Notes due November 2015, Effective Interest Rate of 4.86% [Member]	Aug. 31, 2013 5.500% Senior Notes due November 2015, Effective Interest Rate of 4.86% [Member]	Feb. 15, 2014 6.950% Senior Notes due June 2016, Effective Interest Rate of 7.09% [Member]	Aug. 31, 2013 6.950% Senior Notes due June 2016, Effective Interest Rate of 7.09% [Member]	Feb. 15, 2014 1.300% Senior Notes due January 2017, Effective Interest Rate of 1.43% [Member]	Jan. 14, 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]	Feb. 15, 2014 7.125% Senior Notes due August 2018, Effective Interest Rate of 7.28% [Member]	Aug. 31, 2013 7.125% Senior Notes due August 2018, Effective Interest Rate of 7.28% [Member]	Feb. 15, 2014 4.000% Senior Notes due November 2020, Effective Interest Rate of 4.43% [Member]	Aug. 31, 2013 4.000% Senior Notes due November 2020, Effective Interest Rate of 4.43% [Member]	Feb. 15, 2014 3.700% Senior Notes due April 2022, Effective Interest Rate of 3.85% [Member]	Aug. 31, 2013 3.700% Senior Notes due April 2022, Effective Interest Rate of 3.85% [Member]	Feb. 15, 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 2.875% Senior Notes due January 2023, Effective Interest Rate of 3.21% [Member]	Feb. 15, 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 3.125% Senior Notes due July 2023, Effective Interest Rate of 3.26% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage			6.50%	6.50%	6.50%	5.75%	5.75%	5.50%	5.50%	6.95%	6.95%	1.30%	1.30%	1.30%	7.125%	7.125%	4.00%	4.00%	3.70%	3.70%	2.875%	2.875%	2.875%	3.125%	3.125%	3.125%
Effective interest rate			6.63%		6.63%	5.89%	5.89%	4.86%	4.86%	7.09%	7.09%	1.43%		1.43%	7.28%	7.28%	4.43%	4.43%	3.85%	3.85%	3.21%	3.21%		3.26%	3.26%
Debt instrument, due date			January 2014	January 2014	January 2014	January 2015	January 2015	November 2015	November 2015	June 2016	June 2016	January 2017	January 2017	January 2017	August 2018	August 2018	November 2020	November 2020	April 2022	April 2022	January 2023	January 2023	January 2023	July 2023	July 2023	July 2023
Weighted average interest rate of commercial paper	0.25%	0.29%