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Basis Of Presentation And Summary Of Significant Accounting Policies (Fair Value Of Financial Instruments) (Narrative) (Details) - USD ($)
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2019
Aug. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Carrying value of senior notes $ 114,940,000 $ 113,098,000    
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
Level 2 [Member] | Senior Notes [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Fair value of senior notes 68,200,000      
Carrying value of senior notes $ 69,200,000