Summary of Significant Accounting Policies (Details 5) (USD $) In Thousands, unless otherwise specified	Aug. 31, 2013	Aug. 31, 2012
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive loss	$ (5,163)	$ (5,030)
Unrealized gains on restricted investments, net of tax
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive loss	143	59
Pension and postretirement plan liabilities, net of tax benefit
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive loss	(3,578)	(3,779)
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive loss	$ (1,728)	$ (1,310)