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ACQUISITIONS (Narrative) (Details)
$ in Thousands
3 Months Ended
Apr. 30, 2019
USD ($)
Nov. 01, 2018
USD ($)
Mar. 15, 2018
USD ($)
Sep. 30, 2019
USD ($)
Continuum        
Business Acquisition [Line Items]        
Acquisition date     Mar. 15, 2018  
Cash consideration     $ 52,515  
Estimated future operating results, period     12 months  
Maximum amount of earnout payable     $ 3,135  
Continuum | Design Consultants        
Business Acquisition [Line Items]        
Numbers of employees acquired     125  
Think        
Business Acquisition [Line Items]        
Acquisition date   Nov. 01, 2018    
Cash consideration   $ 26,254    
Estimated future operating results, period   12 months    
Maximum amount of earnout payable   $ 8,156    
True-up payment       $ (271)
test IO        
Business Acquisition [Line Items]        
Acquisition date Apr. 30, 2019      
Cash consideration $ 17,323      
Equity interest acquired 100.00%      
Other 2019 Acquisitions        
Business Acquisition [Line Items]        
Cash consideration       14,080
Maximum amount of earnout payable       $ 3,000
Other 2019 Acquisitions | Minimum        
Business Acquisition [Line Items]        
Estimated future operating results, period       12 months
Other 2019 Acquisitions | Maximum        
Business Acquisition [Line Items]        
Estimated future operating results, period       24 months