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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 |  |  |  |

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