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THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ in Thousands
12 Months Ended
Mar. 31, 2020
USD ($)
reporting_unit
Mar. 31, 2019
USD ($)
reporting_unit
Mar. 31, 2018
USD ($)
Jul. 03, 2019
Apr. 01, 2019
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Capitalized contract cost, amortization period 5 years        
Term of contract     132 months 132 months  
Renewal term       12 months  
Number of reporting units | reporting_unit 1 3      
Advertising expense $ 32,200 $ 25,000 $ 14,500    
Operating lease, right-of-use assets 78,963        
Present value of lease liabilities $ 98,327        
Share-based Compensation Award, Tranche One | Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage 33.33%        
Vesting period 1 year        
Share-based Compensation Award, Tranche One | Performance Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage 50.00% 50.00% 50.00%    
Share-based Compensation Award, Tranche Two | Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period 2 years        
Share-based Compensation Award, Tranche Two | Performance Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage 50.00% 50.00% 50.00%    
Percentage increase (decrease) in shares earned per 1% change in total shareholder returns 2.00% 2.00% 2.00%    
Minimum percentage of common stock performance (30.00%) (30.00%) (30.00%)    
Maximum percentage of number of shares issued per tranche 200.00% 200.00% 200.00%    
Equipment          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Property, plant and equipment, useful life 3 years        
Software and Software Development Costs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Property, plant and equipment, useful life 3 years        
Furniture and fixtures          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Property, plant and equipment, useful life 5 years        
Computer Software, Intangible Asset          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Finite-lived intangible asset, useful life 3 years        
Accounting Standards Update 2016-02          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Operating lease, right-of-use assets         $ 20,000
Present value of lease liabilities         $ 21,400
Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Term of contract 1 year        
Renewal term 12 months        
Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Term of contract 10 years        
Renewal term 5 years