Shareholders' Equity (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended		1 Months Ended	9 Months Ended
	May 31, 2014	Jun. 01, 2013	Jun. 19, 2014 Subsequent Event [Member]	May 31, 2014 Subsequent Event [Member]	May 31, 2014 Class A Treasury Stock [Member]
Components Of Shareholders Equity [Line Items]
Dividend payout	$ 62,010	$ 56,843	$ 20,597
Dividend declared date				Jun. 19, 2014
Dividend declared, per share			$ 0.33
Dividend payable date				Jul. 22, 2014
Dividend record date				Jul. 08, 2014
Class A common stock shares repurchased					1,505
Class A common stock shares repurchase amount	$ 115,606				$ 115,606
Shares repurchased by the company for associates' tax withholding liability associated with share-based compensation					52
Maximum number of shares that may yet be repurchased					2,931