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Debt - FV, Limit (Details) - USD ($)
$ in Thousands
Aug. 31, 2015
Aug. 31, 2014
Long-term debt    
Limit on additional debt borrowings   $ 260,840
3.90% unsecured Senior Notes payable | Book value    
Long-term debt    
Long-term debt $ 60,000  
3.90% unsecured Senior Notes payable | Fair Values | Significant Other Observable Market Inputs (Level 2) | Discounted cash flow analysis    
Long-term debt    
Long-term debt $ 61,550