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SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
12 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Nov. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]            
Amortization period for deferred contract costs       5 years    
Goodwill impairment $ 0 $ 0 $ 0      
Impairment charges recorded       $ 0 $ 0 $ 0
More-likely-than-not benefit likelihood percentage being realized upon ultimate settlement with taxing authority resulting from sustainability of tax examination       50.00%    
Advertising costs       $ 6,900,000 $ 6,100,000 $ 8,900,000
Computer Equipment            
Property, Plant and Equipment [Line Items]            
Property and equipment estimated useful lives       3 years    
Furniture and Fixtures            
Property, Plant and Equipment [Line Items]            
Property and equipment estimated useful lives       5 years    
Minimum | Internal Use Software            
Property, Plant and Equipment [Line Items]            
Useful life of capitalized software       3 years    
Maximum | Internal Use Software            
Property, Plant and Equipment [Line Items]            
Useful life of capitalized software       5 years