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THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
12 Months Ended
Mar. 31, 2019
USD ($)
reporting_unit
Mar. 31, 2018
USD ($)
reporting_unit
Mar. 31, 2017
USD ($)
Apr. 01, 2019
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Capitalized contract cost, amortization period 5 years      
Number of reporting units | reporting_unit 1 3    
Goodwill impairment loss $ 0 $ 8,036,000 $ 0  
Advertising expense $ 25,000,000 $ 14,500,000 $ 9,500,000  
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%    
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%    
Percentage increase (decrease) in shares earned per 1% change in total shareholder returns 2.00% 2.00%    
Minimum percentage of common stock performance (30.00%) (30.00%)    
Maximum percentage of number of shares issued per tranche 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 | Subsequent Event        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Deferred rent credit       $ (1,900,000)
Minimum | Accounting Standards Update 2016-02 | Subsequent Event        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Operating lease, right-of-use asset       13,100,000
Operating lease, liability       15,000,000
Maximum | Accounting Standards Update 2016-02 | Subsequent Event        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Operating lease, right-of-use asset       14,100,000
Operating lease, liability       $ 16,000,000