Financing - Schedule of Debt (Parenthetical) (Detail)	3 Months Ended	12 Months Ended	6 Months Ended	0 Months Ended
	Feb. 14, 2015	Aug. 30, 2014	Feb. 14, 2015	Jan. 14, 2014
5.750% Senior Notes due January 2015, effective interest rate of 5.89% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage	5.75%	5.75%	5.75%
Effective interest rate	5.89%	5.89%	5.89%
Debt instrument maturity, month and year	2015-01	2015-01
5.500% Senior Notes due November 2015, effective interest rate of 4.86% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage	5.50%	5.50%	5.50%
Effective interest rate	4.86%	4.86%	4.86%
Debt instrument maturity, month and year	2015-11	2015-11	2015-11
6.950% Senior Notes due June 2016, effective interest rate of 7.09% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage	6.95%	6.95%	6.95%
Effective interest rate	7.09%	7.09%	7.09%
Debt instrument maturity, month and year	2016-06	2016-06
1.300% Senior Notes due January 2017, effective interest rate 1.43% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage	1.30%	1.30%	1.30%	1.30%
Effective interest rate	1.43%	1.43%	1.43%
Debt instrument maturity, month and year	2017-01	2017-01		2017-01
7.125% Senior Notes due August 2018, effective interest rate of 7.28% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage	7.125%	7.125%	7.125%
Effective interest rate	7.28%	7.28%	7.28%
Debt instrument maturity, month and year	2018-08	2018-08
4.000% Senior Notes due November 2020, effective interest rate of 4.43% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage	4.00%	4.00%	4.00%
Effective interest rate	4.43%	4.43%	4.43%
Debt instrument maturity, month and year	2020-11	2020-11
3.700% Senior Notes due April 2022, effective interest rate of 3.85% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage	3.70%	3.70%	3.70%
Effective interest rate	3.85%	3.85%	3.85%
Debt instrument maturity, month and year	2022-04	2022-04
2.875% Senior Notes due January 2023, effective interest rate of 3.21% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage	2.875%	2.875%	2.875%
Effective interest rate	3.21%	3.21%	3.21%
Debt instrument maturity, month and year	2023-01	2023-01
3.125% Senior Notes due July 2023, effective interest rate of 3.26% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage	3.125%	3.125%	3.125%
Effective interest rate	3.26%	3.26%	3.26%
Debt instrument maturity, month and year	2023-07	2023-07
Commercial paper, weighted average interest rate of 0.40% and 0.27% at February 14, 2015 and August 30, 2014, respectively [Member]
Debt Instrument [Line Items]
Weighted average interest rate of commercial paper	0.40%	0.27%	0.40%