XML 59 R41.htm IDEA: XBRL DOCUMENT v3.10.0.1
Basis Of Presentation And Summary Of Significant Accounting Policies (Fair Value Of Financial Instruments) (Narrative) (Details) - USD ($)
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Carrying value of senior notes $ 62,800,000 $ 134,000,000  
Senior Notes [Member]      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Fair value of senior notes 18,800,000    
Carrying value of senior notes 19,600,000    
Level 2 [Member] | Recurring [Member]      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Assets 0    
Liabilities 0    
Level 2 [Member] | Nonrecurring [Member]      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Assets 0 0 $ 0
Liabilities $ 0 $ 0 $ 0