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Note 8 - Business Combinations (Details) - Assets Acquired - USD ($)
$ in Thousands
May. 31, 2015
Feb. 06, 2015
Aug. 31, 2014
Note 8 - Business Combinations (Details) - Assets Acquired [Line Items]      
Goodwill $ 307,231   $ 285,608
Code Red, Inc. [Member]      
Note 8 - Business Combinations (Details) - Assets Acquired [Line Items]      
Tangible assets acquired 2,514    
Goodwill 29,627 $ 29,600  
Total assets acquired 40,362    
Liabilities assumed (5,612)    
Net assets acquired 34,750    
Computer Software, Intangible Asset [Member] | Code Red, Inc. [Member]      
Note 8 - Business Combinations (Details) - Assets Acquired [Line Items]      
Amortizable intangible assets 4,728    
Customer Relationships [Member] | Code Red, Inc. [Member]      
Note 8 - Business Combinations (Details) - Assets Acquired [Line Items]      
Amortizable intangible assets 3,089    
Noncompete Agreements [Member] | Code Red, Inc. [Member]      
Note 8 - Business Combinations (Details) - Assets Acquired [Line Items]      
Amortizable intangible assets 277    
Trade Names [Member] | Code Red, Inc. [Member]      
Note 8 - Business Combinations (Details) - Assets Acquired [Line Items]      
Amortizable intangible assets $ 127