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STOCK PLANS - Narrative (Details) |  |  |  |  | 3 Months Ended | 12 Months Ended |
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Sep. 10, 2020 shares | Sep. 12, 2019 | Nov. 08, 2018 shares | Mar. 01, 2012 USD ($) shares | Mar. 31, 2022 USD ($) $ / shares shares | Mar. 31, 2022 USD ($) $ / shares shares | Mar. 31, 2021 | Sep. 09, 2020 | Mar. 31, 2020 | Sep. 07, 2011 shares
Restricted stock units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Total unrecognized compensation cost | $ |  |  |  |  | $ 95,900,000 | $ 95,900,000 |  |  |  |
Unrecognized cost, period for recognition, years |  |  |  |  |  | 1 year 3 months 18 days |  |  |  |
Performance Based Restricted Stock Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Performance Measurement Period |  |  |  |  | 3 years |  |  |  |  |
Employee stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares purchased by employees (in shares) |  |  |  |  |  | 498,415 |  |  |  |
Shares issued under ESPP plan, weighted average purchase price per share (in dollars per share) | $ / shares |  |  |  |  | $ 29.26 | $ 29.26 |  |  |  |
Shares available for future issuance under the ESPP (in shares) |  |  |  |  | 1,253,398 | 1,253,398 |  |  |  |
Maximum | Incentive options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Term of options granted, years |  |  |  |  |  | 5 years |  |  |  |
2011 Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, equity awards reserved for issuance (in shares) |  |  |  |  |  |  |  |  |  | 2,500,000
Number of additional shares available (in shares) |  |  | 3,000,000 |  |  |  |  |  |  |
Maximum payroll deductions for purchase of shares by participants |  |  |  | 20.00% |  |  |  |  |  |
Maximum number of shares available for purchased by participants (in shares) |  |  |  | 2,000 |  |  |  |  |  |
Cap on fair value of shares available for purchase by participants | $ |  |  |  | $ 25,000 |  |  |  |  |  |
Percentage of common stock price for employees |  |  |  | 85.00% |  |  |  |  |  |
2011 Employee Stock Purchase Plan | Maximum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Cap on fair value of shares available for purchase by participants | $ |  |  |  | $ 50,000 |  |  |  |  |  |
2019 Amended, Equity Incentive Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of additional shares available (in shares) | 4,700,000 |  |  |  |  |  |  |  |  |
Minimum vesting requirement | 1 year |  |  |  |  |  |  |  |  |
Reduction for each share of common stock pursuant to other than option | 2.32 | 2.76 |  |  |  |  |  |  |  |
Addition in reserve equity | 2.32 |  |  |  |  |  |  | 2.76 |  |
Reduction for each share of common stock pursuant to option |  | 1 |  |  |  |  |  |  |  |
Shares available for grant (in shares) |  |  |  |  | 4,779,939 | 4,779,939 |  |  |  |
2019 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Minimum vesting requirement |  |  |  |  |  | 4 years |  |  |  |
Reduction for each share of common stock pursuant to other than option |  | 1.00 |  |  |  |  |  |  |  |
Shares available for grant (in shares) |  |  |  |  | 4,627,934 | 4,627,934 |  |  |  |
Percentage of incentive stock option granted |  |  |  |  |  | 110.00% |  |  |  |
2019 Equity Incentive Plan | Maximum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Term of options granted, years |  |  |  |  |  | 7 years |  |  |  |
2019 Equity Incentive Plan | Minimum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of fair market value of common stock |  |  |  |  |  | 100.00% |  |  |  |
Percentage of voting stock |  |  |  |  |  | 10.00% |  |  |  |
2007 Equity Incentive Plan | Independent Directors |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of annualized forfeiture rate for awards granted |  |  |  |  |  | 0.00% | 0.00% |  | 0.00% |
2007 Equity Incentive Plan | Senior Executives |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of annualized forfeiture rate for awards granted |  |  |  |  |  | 2.00% | 2.00% |  | 2.00% |
2007 Equity Incentive Plan | Employees |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of annualized forfeiture rate for awards granted |  |  |  |  |  | 5.00% | 5.00% |  | 5.00% |

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