Share-based Compensation Stock Options (Details) (USD $)	12 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in Period, Total Fair Value			$ 3,000,000
Options, Exercises in Period, Intrinsic Value (Less Than $1 Million For the Years Ended August 31, 2013 and 2012)		1,000,000	1,000,000
Options Vested	307,855	0	0
Options, Outstanding [Roll Forward]
Outstanding, Beginning Balance	555,000	612,000	319,000
Granted	0	0	323,000
Exercised	(9,000)	(15,000)	(25,000)
Canceled	(20,000)	(42,000)	(5,000)
Outstanding, Ending Balance	526,000	555,000	612,000	319,000
Weighted Average Exercise Price:
Weighted Average Exercise Price, Beginning Balance	$ 32.07	$ 31.94	$ 28.50
Weighted Average Grant Date Fair Value	$ 0.00	$ 0.00	$ 34.75
Exercises, Weighted Average Exercise Price	$ 25.56	$ 20.48	$ 24.03
Canceled, Weighted Average Exercise Price	$ 30.55	$ 34.39	$ 34.59
Weighted Average Exercise Price, Ending Balance	$ 32.25	$ 32.07	$ 31.94	$ 28.50
Weighted average Remaining Contractual Term [Abstract]
Weighted Average Remaining Contractual Term (in years)	2 years 2 months	3 years 1 month	3 years 11 months	3 years 11 months
Aggregate Intrinsic Value:
Aggregate Intrinsic Value	335,000	47,000	459,000	5,430,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options	$ 0
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period			2 years
Award Contractual Term			5 years
Exercise Price Premium			20.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate			0.48%
Expected dividend yield			2.59%
Expected term (in years)			3 years 9 months
Expected volatility			58.15%
Fair value of option			$ 9.29