Goodwill and Other Intangible Assets, net Intangible Assets (Details) (USD $)	12 Months Ended
	Aug. 31, 2014		Aug. 31, 2013		Aug. 31, 2012
Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,173,000	[1]	$ 1,173,000	[1]
Total Gross Carrying Amount	25,447,000		27,403,000
Accumulated Amortization	(15,612,000)		(14,139,000)
Amortization of intangible assets	4,000,000		5,000,000		5,000,000
Estimated amortization expense:
2015	2,666,000
2016	1,580,000
2017	778,000
2018	458,000
2019	307,000
Thereafter	2,872,000
Total	8,661,000
Covenants not to compete
Intangible Assets [Line Items]
Gross Carrying Amount	18,747,000		20,183,000
Accumulated Amortization	(11,768,000)		(10,796,000)
Supply contracts
Intangible Assets [Line Items]
Gross Carrying Amount	2,264,000		2,264,000
Accumulated Amortization	(2,109,000)		(1,725,000)
Other intangible assets subject to amortization
Intangible Assets [Line Items]
Gross Carrying Amount	3,263,000	[2]	3,783,000	[2]
Accumulated Amortization	$ (1,735,000)	[2]	$ (1,618,000)	[2]

[1] Indefinite-lived intangibles include trade names, permits and licenses and real property options.

[2] Other intangible assets subject to amortization include trade names, marketing agreements, employment agreements, leasehold interests, permits and licenses and real property options.