Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Aug. 31, 2014	Aug. 31, 2013
Deferred tax assets:
Allowance for doubtful accounts and notes receivable	$ 677	$ 898
Leasing transactions	3,252	3,599
Deferred income	1,773	4,124
Accrued liabilities	3,399	1,995
Stock compensation	4,921	8,024
Other	688	676
State net operating losses	11,305	8,703
Total deferred tax assets	26,015	28,019
Valuation allowance	(11,305)	(8,703)
Total deferred tax assets after valuation allowance	14,710	19,316
Deferred tax liabilities:
Prepaid expenses	(1,498)	(1,369)
Investment in partnerships, including differences in capitalization, depreciation and direct financing leases	(2,954)	(2,061)
Property, equipment and capital leases	(24,655)	(25,433)
Intangibles and other assets	(19,514)	(18,337)
Debt extinguishment	(3,353)	(4,191)
Total deferred tax liabilities	(51,974)	(51,391)
Net deferred tax liabilities	(37,264)	(32,075)
Net deferred tax assets and liabilities are classified as follows:
Current	347	2,840
Noncurrent	(37,611)	(34,915)
Net deferred tax liabilities	$ (37,264)	$ (32,075)