Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2012
Income Tax Contingency [Line Items]
Additional income tax provision			$ 1,559,000
State net operating loss carryforwards, valuation allowance	11,300,000	8,700,000
Unrecognized tax benefits	2,461,000	2,583,000	5,451,000
Unrecognized tax benefits, accrued interest and penalty	400,000	300,000
Decrease in unrecognized tax benefits	100,000
Unrecognized tax benefits, income tax penalties and interest net benefit		400,000	100,000
Unrecognized tax benefits favorably impact the effective tax rate	2,500,000	2,600,000
Possible change in unrecognized tax benefits, lower bound	100,000
Possible change in unrecognized tax benefits, upper bound	(1,900,000)
Income taxes receivable		9,800,000
Income taxes receivable, current	$ 1,887,000	$ 7,728,000
Minimum [Member]
Income Tax Contingency [Line Items]
Operating Loss Carryforwards, Expiration Dates	Dec. 01, 2014
Maximum [Member]
Income Tax Contingency [Line Items]
Operating Loss Carryforwards, Expiration Dates	May 31, 2035