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Note 8 - Business Combinations - Business Acquired (Details) - USD ($)
$ in Thousands
Aug. 31, 2017
Mar. 17, 2017
Nov. 08, 2016
Sep. 23, 2016
Aug. 31, 2016
Oct. 16, 2015
Aug. 31, 2015
Goodwill $ 707,560       $ 452,915   $ 308,287
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