Income Tax (Unrecognized Tax Benefits) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2011
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Beginning Balance	$ 27,384	$ 10,762	$ 20,367
Change in tax positions of current year	1,255	0	2,440
Change for tax positions of prior years	0	18,006	(12,045)
Reductions due to settlements with taxing authorities	(88)	(600)	0
Reductions due to statute of limitations lapse	0	(784)	0
Unrecognized Tax Benefits, Ending Balance	$ 28,551	$ 27,384	$ 10,762