Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Aug. 31, 2017	Aug. 31, 2016
Deferred tax assets:
Allowance for doubtful accounts and notes receivable	$ 419	$ 387
Leasing transactions	3,083	3,222
Deferred income	3,011	2,991
Accrued liabilities	4,339	6,187
Stock compensation	3,156	2,446
Other	929	757
State net operating losses	18,031	16,303
Total deferred tax assets	32,968	32,293
Valuation allowance	(16,254)	(14,638)
Total deferred tax assets after valuation allowance	16,714	17,655
Deferred tax liabilities:
Prepaid expenses	(956)	(1,119)
Investment in partnerships, including differences in capitalization, depreciation and direct financing leases	(4,026)	(4,125)
Property, equipment and capital leases	(23,756)	(31,565)
Intangibles and other assets	(22,983)	(21,628)
Debt extinguishment	(838)	(1,676)
Direct financing lease	(4,256)	(72)
Total deferred tax liabilities	(56,815)	(60,185)
Net deferred tax liabilities (noncurrent)	$ (40,101)	$ (42,530)