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Note 8 - Business Combinations - Business Acquired (Details) - USD ($)
$ in Thousands
Aug. 31, 2018
Aug. 31, 2017
Mar. 17, 2017
Nov. 08, 2016
Oct. 16, 2016
Aug. 31, 2016
Goodwill $ 701,833 $ 707,560       $ 452,915
BI-SAM Technologies [Member]            
Tangible assets acquired     $ 27,583      
Goodwill     173,898      
Total assets acquired     258,080      
Liabilities assumed     (40,443)      
Net assets acquired     217,637      
BI-SAM Technologies [Member] | Computer Software, Intangible Asset [Member]            
Amortizable intangible assets     18,261      
BI-SAM Technologies [Member] | Customer Relationships [Member]            
Amortizable intangible assets     37,597      
BI-SAM Technologies [Member] | Trade Names [Member]            
Amortizable intangible assets     $ 741      
Vermilion Holdings Limited [Member]            
Tangible assets acquired       $ 7,916    
Goodwill       51,157    
Total assets acquired       77,320    
Liabilities assumed       (9,434)    
Net assets acquired       67,886    
Vermilion Holdings Limited [Member] | Computer Software, Intangible Asset [Member]            
Amortizable intangible assets       10,916    
Vermilion Holdings Limited [Member] | Customer Relationships [Member]            
Amortizable intangible assets       5,954    
Vermilion Holdings Limited [Member] | Trade Names [Member]            
Amortizable intangible assets       571    
Vermilion Holdings Limited [Member] | Noncompete Agreements [Member]            
Amortizable intangible assets       $ 806    
Portware LLC [Member]            
Tangible assets acquired         $ 9,656  
Goodwill         187,378  
Total assets acquired         272,534  
Liabilities assumed         (8,951)  
Net assets acquired         263,583  
Portware LLC [Member] | Computer Software, Intangible Asset [Member]            
Amortizable intangible assets         43,000  
Portware LLC [Member] | Customer Relationships [Member]            
Amortizable intangible assets         27,000  
Portware LLC [Member] | Trade Names [Member]            
Amortizable intangible assets         2,000  
Portware LLC [Member] | Noncompete Agreements [Member]            
Amortizable intangible assets         $ 3,500