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Basis Of Presentation And Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Aug. 31, 2020
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]      
Unrealized foreign currency transactions $ (52,000) $ (394,000)  
Carrying value of senior notes 114,712,000   $ 113,098,000
Assets 386,398,000   362,637,000
Liabilities 211,898,000   202,324,000
Foreign Currency Forward Contracts [Member]      
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]      
Foreign currency forward contracts outstanding $ 13,700,000    
Foreign currency forward contracts, Maturity date Jan. 28, 2021    
Realized foreign currency transactions $ 0 $ 0  
Unrealized foreign currency transactions 0   $ 0
Level 2 [Member] | Recurring [Member]      
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]      
Assets 0    
Liabilities 0    
Level 2 [Member] | Nonrecurring [Member]      
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]      
Liabilities 0    
Senior Notes [Member] | Level 2 [Member]      
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]      
Fair value of senior notes 70,200,000    
Carrying value of senior notes $ 69,600,000