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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

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