Share-Based Payments - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 15, 2014	Feb. 09, 2013	Feb. 15, 2014	Feb. 09, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Total share-based compensation expense related to stock options and share purchase plans	$ 11.5	$ 8.5	$ 20.7	$ 16.6
Stock options exercised - Shares			142,816	413,485
Stock options exercised - Weighted average exercise price			$ 192.70	$ 129.00
Stock options granted			347,615	355,560
Weighted average grant date fair value of options granted			$ 96.92	$ 98.09
Anti-dilutive shares excluded from the computation of earnings per share	0	375,980	5,830	375,980