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STOCKHOLDERS' EQUITY: - Performance-based restricted stock units (Details) - Restricted stock units $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2020 USD ($) shares | Mar. 31, 2019 USD ($) shares | Mar. 31, 2018 USD ($) numberOfIncrement shares
Performance stock |  |  |
Share-based compensation |  |  |
Granted (in shares) | 202,818 | 534,438 | 389,065
Aggregate fair value of restricted stock units granted | $ | $ 12,300 | $ 22,000 | $ 10,100
Forfeited in period (in shares) | 51,560 |  |
The total fair value of performance-based restricted stock units | $ |  | $ 2,200 | $ 14,100
Vesting Based On Relevant Performance Period For First Performance Plan At March 31, 2019 |  |  |
Share-based compensation |  |  |
Granted (in shares) |  | 186,539 |
Aggregate fair value of restricted stock units granted | $ |  | $ 5,800 |
Vesting Based On Relevant Performance Period For First Performance Plan At March 31, 2019 | Minimum |  |  |
Share-based compensation |  |  |
Equity instrument other than options, percentage of vesting |  | 25.00% |
Vesting Based On Relevant Performance Period For First Performance Plan At March 31, 2019 | Maximum |  |  |
Share-based compensation |  |  |
Equity instrument other than options, percentage of vesting |  | 200.00% |
Performance Shares Vesting Total Shareholder Return |  |  |
Share-based compensation |  |  |
Granted (in shares) | 60,844 |  |
Aggregate fair value of restricted stock units granted | $ | $ 4,400 |  |
Performance Shares Vesting Total Shareholder Return | Minimum |  |  |
Share-based compensation |  |  |
Award vesting rights percentage | 0.00% |  |
Performance Shares Vesting Total Shareholder Return | Maximum |  |  |
Share-based compensation |  |  |
Award vesting rights percentage | 200.00% |  |
Vesting Based On Relevant Performance Period For Second Performance Plan At March 31, 2019 |  |  |
Share-based compensation |  |  |
Granted (in shares) |  | 347,899 |
Aggregate fair value of restricted stock units granted | $ |  | $ 16,200 |
Vesting Based On Relevant Performance Period For Second Performance Plan At March 31, 2019 | Minimum |  |  |
Share-based compensation |  |  |
Equity instrument other than options, percentage of vesting |  | 0.00% |
Vesting Based On Relevant Performance Period For Second Performance Plan At March 31, 2019 | Maximum |  |  |
Share-based compensation |  |  |
Equity instrument other than options, percentage of vesting |  | 200.00% |
Share-based Payment Arrangement, Tranche One |  |  |
Share-based compensation |  |  |
Granted (in shares) |  |  | 184,931
Aggregate fair value of restricted stock units granted | $ |  |  | $ 5,100
Vesting in period (in shares) |  | 61,330 | 580,133
Share-based Payment Arrangement, Tranche One | Minimum |  |  |
Share-based compensation |  |  |
Equity instrument other than options, percentage of vesting |  |  | 0.00%
Share-based Payment Arrangement, Tranche One | Maximum |  |  |
Share-based compensation |  |  |
Equity instrument other than options, percentage of vesting |  |  | 200.00%
Vesting Based on Relevant Performance Period Over Two Periods at March 31, 2018 |  |  |
Share-based compensation |  |  |
Granted (in shares) |  |  | 87,184
Aggregate fair value of restricted stock units granted | $ |  |  | $ 2,100
Award vesting rights percentage |  | 50.20% | 50.20%
Forfeited in period (in shares) |  | 43,768 | 43,768
Performance-based Restricted Stock Units Vesting In Three Equal Tranches |  |  |
Share-based compensation |  |  |
Granted (in shares) |  |  | 116,950
Aggregate fair value of restricted stock units granted | $ |  |  | $ 2,900
Number of tranches | numberOfIncrement |  |  | 3
Performance-based Restricted Stock Units Vesting In Three Equal Tranches | Minimum |  |  |
Share-based compensation |  |  |
Award vesting rights percentage |  |  | 0.00%
Performance-based Restricted Stock Units Vesting In Three Equal Tranches | Maximum |  |  |
Share-based compensation |  |  |
Award vesting rights percentage |  |  | 300.00%
Vesting Based on Relevant Performance Period at March 31, 2019 |  |  |
Share-based compensation |  |  |
Award vesting rights percentage |  | 53.30% | 53.30%
Forfeited in period (in shares) |  | 17,562 | 17,562
Vesting Based on Relevant Performance Period at March 31, 2020 |  |  |
Share-based compensation |  |  |
Award vesting rights percentage | 0.00% | 0.00% |
Vesting in period (in shares) | 18,275 |  |
Performance Shares Vesting In Three Equal Annual Increments |  |  |
Share-based compensation |  |  |
Granted (in shares) | 59,480 |  |
Vesting period | 3 years |  |
Performance Shares Vesting Under The Second Plan |  |  |
Share-based compensation |  |  |
Granted (in shares) | 141,974 |  |
Aggregate fair value of restricted stock units granted | $ | $ 7,900 |  |
Performance Shares Vesting Under The Second Plan | Minimum |  |  |
Share-based compensation |  |  |
Award vesting rights percentage | 0.00% |  |
Performance Shares Vesting Under The Second Plan | Maximum |  |  |
Share-based compensation |  |  |
Award vesting rights percentage | 200.00% |  |
Performance Shares Based On Attainment Of Revenue Compound Annual Growth Rate Target |  |  |
Share-based compensation |  |  |
Granted (in shares) | 82,494 |  |
Vesting Based on Relevant Performance Period Over Two Periods at March 31 2020 [Member] |  |  |
Share-based compensation |  |  |
Award vesting rights percentage | 164.36% |  |
Forfeited in period (in shares) | 97,761 |  |

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