Quarterly report pursuant to Section 13 or 15(d)

Acquisitions Acquisitions (Details)

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Acquisitions Acquisitions (Details) - USD ($)
$ in Thousands
 3 Months Ended
May 11, 2018
Dec. 01, 2017
Nov. 30, 2018
Nov. 30, 2017
Business Acquisition [Line Items]        
Goodwill, Acquired During Period     $ 253  
Equalizer [Member]        
Business Acquisition [Line Items]        
Business Acquisition, Date of Acquisition Agreement May 11, 2018      
Cash paid for business acquisitions, Net of Cash Acquired $ 5,800      
Goodwill, Acquired During Period 2,400      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 2,100      
Equalizer [Member] | Tradenames        
Business Acquisition [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 800      
Mirage Machines [Domain]        
Business Acquisition [Line Items]        
Business Acquisition, Date of Acquisition Agreement   Dec. 01, 2017    
Cash paid for business acquisitions, Net of Cash Acquired   $ 17,400    
Goodwill, Acquired During Period   10,300    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   4,100    
Acquisition Costs, Period Cost       $ 200
Mirage Machines [Domain] | Tradenames        
Business Acquisition [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   2,300    
FY18 Acquisitions (Mirage Machines and Equalizer) [Domain]        
Business Acquisition [Line Items]        
Net sales     $ 3,500  
Customer relationships | Equalizer [Member]        
Business Acquisition [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 1,100      
Customer relationships | Mirage Machines [Domain]        
Business Acquisition [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   $ 1,800    
Patents | Equalizer [Member]        
Business Acquisition [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 200