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Note 8 - Business Combinations (Details Textual)
12 Months Ended
Mar. 17, 2017
USD ($)
Nov. 08, 2016
USD ($)
Oct. 16, 2015
USD ($)
Aug. 31, 2017
USD ($)
Aug. 31, 2016
USD ($)
Finite-lived Intangible Assets Acquired       $ 93,200,000  
Goodwill, Acquired During Period       235,402,000 $ 187,352,000
BI-SAM Technologies [Member]          
Finite-lived Intangible Assets Acquired $ 56,600,000        
BI-SAM Technologies [Member] | Customer Relationships [Member]          
Finite-Lived Intangible Asset, Useful Life 16 years        
BI-SAM Technologies [Member] | Computer Software, Intangible Asset [Member]          
Finite-Lived Intangible Asset, Useful Life 5 years        
BI-SAM Technologies [Member] | Trade Names [Member]          
Finite-Lived Intangible Asset, Useful Life 4 years        
BI-SAM Technologies [Member] | Selling, General and Administrative Expenses [Member]          
Business Combination, Acquisition Related Costs       3,200,000  
Vermilion Holdings Limited [Member]          
Finite-lived Intangible Assets Acquired   $ 18,200,000      
Goodwill, Acquired During Period   $ 51,200,000      
Vermilion Holdings Limited [Member] | Customer Relationships [Member]          
Finite-Lived Intangible Asset, Useful Life   15 years      
Vermilion Holdings Limited [Member] | Computer Software, Intangible Asset [Member]          
Finite-Lived Intangible Asset, Useful Life   6 years      
Vermilion Holdings Limited [Member] | Trade Names [Member]          
Finite-Lived Intangible Asset, Useful Life   4 years      
Vermilion Holdings Limited [Member] | Noncompete Agreements [Member]          
Finite-Lived Intangible Asset, Useful Life   3 years      
Vermilion Holdings Limited [Member] | Selling, General and Administrative Expenses [Member]          
Business Combination, Acquisition Related Costs       700,000  
Portware LLC [Member]          
Business Combination, Consideration Transferred     $ 263,600,000    
Business Combination, Acquisition Related Costs         $ 700,000
Finite-lived Intangible Assets Acquired     75,500,000 93,194,000  
Goodwill, Acquired During Period     $ 187,400,000    
Goodwill Percentage Per Segment     77.00%    
Portware LLC [Member] | Customer Relationships [Member]          
Finite-lived Intangible Assets Acquired       50,152,000  
Finite-Lived Intangible Asset, Useful Life     16 years    
Portware LLC [Member] | Computer Software, Intangible Asset [Member]          
Finite-Lived Intangible Asset, Useful Life     8 years    
Portware LLC [Member] | Trade Names [Member]          
Finite-lived Intangible Assets Acquired       1,354,000  
Finite-Lived Intangible Asset, Useful Life     5 years    
Portware LLC [Member] | Noncompete Agreements [Member]          
Finite-lived Intangible Assets Acquired       $ 862,000  
Finite-Lived Intangible Asset, Useful Life     7 years    
Minimum [Member]          
Finite-Lived Intangible Asset, Useful Life       2 years  
BI-SAM Technologies [Member]          
Business Combination, Consideration Transferred $ 217,600,000        
Goodwill, Acquired During Period $ 173,900,000        
BI-SAM Technologies [Member] | Minimum [Member]          
Entity Number of Employees 160        
Vermilion Holdings Limited [Member]          
Business Combination, Consideration Transferred   $ 67,900,000      
Entity Number of Employees   59      
Portware LLC [Member]          
Entity Number of Employees     166