Goodwill And Other Intangible Assets Goodwill And Other Intangible Assets (Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Aug. 31, 2012	Aug. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 44,275	$ 49,682
Accumulated Amortization	19,085	17,344
Net	25,190	32,338
Customer base [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	33,928	34,128
Accumulated Amortization	17,133	12,714
Net	16,795	21,414
Non-competition agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	0	4,183
Accumulated Amortization	0	3,281
Net	0	902
Favorable land leases [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	6,133	7,063
Accumulated Amortization	527	521
Net	5,606	6,542
Brand name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,113	4,207
Accumulated Amortization	1,394	803
Net	2,719	3,404
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	101	101
Accumulated Amortization	31	25
Net	$ 70	$ 76