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Commitments and Contingencies - Schedule of Future Minimum Noncancellable Operating Lease Payments (Details) (USD $) In Thousands, unless otherwise specified	Aug. 31, 2012
Schedule of Future Minimum Payments on Operating Lease Commitments
2012	$ 48,959
2013	39,245
2014	33,778
2015	31,078
2016	24,215
Thereafter	25,734
Total minimum future lease payments	203,009
Rail Cars
Schedule of Future Minimum Payments on Operating Lease Commitments
2012	13,307
2013	10,452
2014	9,500
2015	8,401
2016	7,388
Thereafter	8,050
Total minimum future lease payments	57,098
Vehicles
Schedule of Future Minimum Payments on Operating Lease Commitments
2012	20,885
2013	16,425
2014	13,233
2015	12,894
2016	8,426
Thereafter	2,415
Total minimum future lease payments	74,278
Equipment and Other
Schedule of Future Minimum Payments on Operating Lease Commitments
2012	14,767
2013	12,368
2014	11,045
2015	9,783
2016	8,401
Thereafter	15,269
Total minimum future lease payments	$ 71,633

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