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STOCK-BASED COMPENSATION - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) tranche shares | Sep. 30, 2021 USD ($) tranche shares | Sep. 30, 2020 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of tranches | tranche | 3 | 3 |
Number of shares repurchased (in shares) | shares |  | 0 | 0
Employee Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total intrinsic value of options exercised |  | $ 13.3 | $ 0.3
Unrecognized compensation cost | $ 0.1 | $ 0.1 |
Weighted average period of recognition for unrecognized compensation expense |  | 8 months 26 days |
Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost | 138.7 | $ 138.7 |
Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost | 24.8 | $ 24.8 |
Change in number of shares earned |  | 2.00% |
Maximum percentage of awards to be earned |  | 200.00% |
Number of shares earned (in shares) | shares |  | 0 |
Performance Shares | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting performance period percentage |  | 0.00% |
Total shareholder return performance, lowest percentage to still earn awards |  | (30.00%) |
Volatility factors |  | 58.70% |
Performance Shares | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting performance period percentage |  | 200.00% |
Volatility factors |  | 59.70% |
Performance Shares | Tranche One | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting performance period percentage |  | 90.00% |
Performance Shares | Tranche One | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting performance period percentage |  | 110.00% |
Salary and Bonus Stock Program |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost | 4.5 | $ 4.5 |
Volatility factors |  | 58.70% |
Employee Stock Purchase Plan | Employee Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost | $ 3.6 | $ 3.6 |
Weighted average period of recognition for unrecognized compensation expense |  | 7 months 6 days |
Number of shares reserved for future issuance (in shares) | shares | 2,522,952 | 2,522,952 |

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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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