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Segment Information (Disaggregation Of Revenue By Type Of Service) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
May 31, 2019
May 31, 2018
May 31, 2019
May 31, 2018
Disaggregation of Revenue [Line Items]        
Revenue $ 56,006 $ 50,461 $ 160,191 $ 144,939
Education Practice [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 11,088 9,235    
Services And Products [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 31,763 30,078 87,763 86,299
Services And Products [Member] | Education Practice [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 5,065 4,425    
Subscriptions [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 18,927 14,869 55,097 41,450
Subscriptions [Member] | Education Practice [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 5,564 3,732    
Royalties [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 3,799 4,162 13,141 13,380
Royalties [Member] | Education Practice [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 459 1,078    
Leases And Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 1,517 1,352 4,190 3,810
Operating Segments [Member] | Enterprise Division [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 43,401 39,874 124,869 113,711
Operating Segments [Member] | Education Practice [Member]        
Disaggregation of Revenue [Line Items]        
Revenue     31,132 27,418
Operating Segments [Member] | Direct Offices [Member] | Enterprise Division [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 40,387 36,331 115,271 103,802
Operating Segments [Member] | International Licensees [Member] | Enterprise Division [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 3,014 3,543 9,598 9,909
Operating Segments [Member] | Services And Products [Member] | Enterprise Division [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 26,698 25,653 76,198 73,693
Operating Segments [Member] | Services And Products [Member] | Education Practice [Member]        
Disaggregation of Revenue [Line Items]        
Revenue     11,565 12,606
Operating Segments [Member] | Services And Products [Member] | Direct Offices [Member] | Enterprise Division [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 26,295 24,842 74,405 71,823
Operating Segments [Member] | Services And Products [Member] | International Licensees [Member] | Enterprise Division [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 403 811 1,793 1,870
Operating Segments [Member] | Subscriptions [Member] | Enterprise Division [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 13,363 11,137 38,453 30,236
Operating Segments [Member] | Subscriptions [Member] | Education Practice [Member]        
Disaggregation of Revenue [Line Items]        
Revenue     16,644 11,214
Operating Segments [Member] | Subscriptions [Member] | Direct Offices [Member] | Enterprise Division [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 13,363 11,137 38,453 30,236
Operating Segments [Member] | Royalties [Member] | Enterprise Division [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 3,340 3,084 10,218 9,782
Operating Segments [Member] | Royalties [Member] | Education Practice [Member]        
Disaggregation of Revenue [Line Items]        
Revenue     2,923 3,598
Operating Segments [Member] | Royalties [Member] | Direct Offices [Member] | Enterprise Division [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 729 352 2,413 1,743
Operating Segments [Member] | Royalties [Member] | International Licensees [Member] | Enterprise Division [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 2,611 2,732 7,805 8,039
Corporate And Eliminations [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 1,517 1,352 4,190 3,810
Corporate And Eliminations [Member] | Leases And Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue $ 1,517 $ 1,352 $ 4,190 $ 3,810