Long-Term Debt - Principal Payments on Long-term Debt and Capital Lease Obligations (Details) (USD $) In Thousands, unless otherwise specified	Aug. 31, 2014	Aug. 31, 2013
Long-term Debt, by Maturity [Abstract]
2015	$ 40
2016	84
2017	305,089
2018	95
2019	100
Thereafter	8,302
Total	313,710
Amounts representing interest and executory costs	0
Total long-term debt	313,710
Capital Leases, Future Minimum Payments, Net Minimum Payments [Abstract]
2015	1,310
2016	1,180
2017	1,181
2018	1,181
2019	1,202
Thereafter	6,330
Total	12,384
Amounts representing interest and executory costs	(6,729)
Total less interest	5,655	5,666
Long Term Debt and Capital Lease Obligations Due [Abstract]
2015	1,350
2016	1,264
2017	306,270
2018	1,276
2019	1,302
Thereafter	14,632
Total	326,094
Amounts representing interest and executory costs	(6,729)
Total Long-term debt	$ 319,365	$ 373,337