Long-Term Debt - Principal Payments on Long-term Debt and Capital Lease Obligations (Details) - USD ($) $ in Thousands	Aug. 31, 2015	Aug. 31, 2014
Long-term Debt, by Maturity [Abstract]
2016	$ 84
2017	215,087
2018	92
2019	98
2020	89
Thereafter	8,098
Total	223,548
Amounts representing interest and executory costs	0
Total long-term debt	223,548
Capital Leases, Future Minimum Payments, Net Minimum Payments [Abstract]
2016	1,175
2017	1,176
2018	910
2019	878
2020	862
Thereafter	2,775
Total	7,776
Amounts representing interest and executory costs	(3,168)
Total less interest	4,608	$ 5,655
Long Term Debt and Capital Lease Obligations Due [Abstract]
2016	1,259
2017	216,263
2018	1,002
2019	976
2020	951
Thereafter	10,873
Total	231,324
Amounts representing interest and executory costs	(3,168)
Total long-term debt	$ 228,156	$ 319,365