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Business Acquisitions (Schedule Of Estimated Fair Values Of Assets Acquired, Liabilities Assumed, and Identifiable Intangible Assets) (Details) - USD ($)
$ in Thousands
Aug. 31, 2019
Dec. 05, 2018
Aug. 31, 2018
Jul. 11, 2017
May 15, 2017
Business Acquisition, Contingent Consideration [Line Items]          
Goodwill $ 24,220   $ 24,220    
Germany, Switzerland, And Austria Licensee [Member]          
Business Acquisition, Contingent Consideration [Line Items]          
Cash   $ 127      
Accounts receivable   564      
Inventories   80      
Prepaid expenses and other current assets   45      
Intangible assets   741      
Property and equipment   27      
Other long-term assets   11      
Assets acquired   1,595      
Accounts payable   (208)      
Accrued liabilities   (383)      
Income taxes payable   (47)      
Liabilities assumed   (638)      
Purchase price   $ 957      
Robert Gregory Partners [Member]          
Business Acquisition, Contingent Consideration [Line Items]          
Accounts receivable         $ 458
Prepaid expenses and other current assets         136
Intangible assets         3,811
Goodwill         1,232
Assets acquired         5,637
Accounts payable         (51)
Accrued liabilities         (80)
Deferred revenue         (593)
Liabilities assumed         (724)
Purchase price         $ 4,913
Jhana Education [Member]          
Business Acquisition, Contingent Consideration [Line Items]          
Cash       $ 253  
Accounts receivable       195  
Prepaid expenses and other current assets       86  
Deferred tax asset       3,138  
Intangible assets       6,076  
Goodwill       3,085  
Assets acquired       12,833  
Accounts payable       (185)  
Accrued liabilities       (19)  
Deferred tax liability       (2,257)  
Deferred revenue       (795)  
Liabilities assumed       (3,256)  
Purchase price       $ 9,577