Shareholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended			1 Months Ended	12 Months Ended		12 Months Ended		12 Months Ended
	Aug. 30, 2014	Aug. 31, 2013	Sep. 01, 2012	Oct. 31, 2014 Subsequent Event [Member]	Aug. 30, 2014 Special Dividend [Member] Subsequent Event [Member]	Oct. 27, 2014 Special Dividend [Member] Subsequent Event [Member]	Aug. 30, 2014 Ordinary Dividend [Member] Subsequent Event [Member]	Oct. 22, 2014 Ordinary Dividend [Member] Subsequent Event [Member]	Aug. 30, 2014 Class A Common Stock [Member]	Aug. 31, 2013 Class A Common Stock [Member]	Aug. 30, 2014 Class B Common Stock [Member]	Aug. 31, 2013 Class B Common Stock [Member]	Aug. 30, 2014 Class A Treasury Stock [Member]	Aug. 31, 2013 Class A Treasury Stock [Member]	Sep. 01, 2012 Class A Treasury Stock [Member]
Components Of Shareholders Equity [Line Items]
Number of shares authorized for repurchase													5,000,000
Maximum number of shares that may yet be repurchased													2,075,000
Class A common stock shares repurchased													2,370,000	52,000	671,000
Class A common stock shares repurchase amount	$ 191,359	$ 3,773	$ 48,098										$ 191,359	$ 3,773	$ 48,098
Shares repurchased by the company for associates' tax withholding liability associated with share-based compensation													60,000	52,000
Treasury stock reissued to fund plan. shares													54,000	53,000
Common stock, voting rights									1	1	10	10
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Dividend declared date					Oct. 27, 2014		Oct. 22, 2014
Dividend declared, per share				$ 3.40		$ 3.00		$ 0.40
Dividend payable date							Nov. 26, 2014
Dividend record date							Nov. 18, 2014
Dividend payout	$ 82,607	$ 75,860	$ 63,024	$ 209,378