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STOCK PLANS (Tables) | 12 Months Ended
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Mar. 31, 2025
Share-Based Payment Arrangement [Abstract] |
Schedule of Share-Based Compensation Expense | The following is a summary of share-based compensation expense including restricted stock units and performance-based restricted stock units granted pursuant to the Company's Amended 2007 Plan and the Amended 2019 Plan, and employee stock purchases made under the ESPP, based on estimated fair values within the applicable cost and expense lines identified below (in thousands):
| Fiscal Year Ended March 31,
| 2025 |  | 2024 |  | 2023
Cost of product revenue | $ | 1,296 |  |  | $ | 1,330 |  |  | $ | 1,129 |
Cost of service revenue | 8,510 |  |  | 8,899 |  |  | 7,286 |
Research and development | 17,956 |  |  | 19,281 |  |  | 17,055 |
Sales and marketing | 22,765 |  |  | 25,375 |  |  | 22,612 |
General and administrative | 14,258 |  |  | 15,914 |  |  | 13,904 |
| $ | 64,785 |  |  | $ | 70,799 |  |  | $ | 61,986 |
Schedule of Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity | Transactions under the Amended 2007 and the Amended 2019 Plan during the fiscal years ended March 31, 2025, 2024 and 2023 are summarized in the table below.
|  |  | Restricted Stock Units
|  |  |  |  | Number of Awards |  | Weighted Average Fair Value
Outstanding – March 31, 2022 |  |  |  |  | 4,627,934 |  |  | $ | 28.23 |
Granted |  |  |  |  | 3,096,295 |  |  | 33.73 |
Vested |  |  |  |  | (1,777,708) |  |  | 28.34 |
Canceled |  |  |  |  | (197,050) |  |  | 30.93 |
Outstanding – March 31, 2023 |  |  |  |  | 5,749,471 |  |  | $ | 31.07 |
Granted |  |  |  |  | 2,446,494 |  |  | 28.87 |
Vested |  |  |  |  | (2,067,558) |  |  | 30.08 |
Canceled |  |  |  |  | (207,736) |  |  | 31.17 |
Outstanding – March 31, 2024 |  |  |  |  | 5,920,671 |  |  | $ | 30.50 |
Granted |  |  |  |  | 2,449,057 |  |  | 18.84 |
Vested |  |  |  |  | (2,205,063) |  |  | 30.20 |
Canceled |  |  |  |  | (418,676) |  |  | 29.02 |
Outstanding – March 31, 2025 |  |  |  |  | 5,745,989 |  |  | $ | 25.75 |
Schedule of Aggregate Intrinsic Values of Stock Options and Restricted Stock Units | The aggregate intrinsic value of stock options exercised and the fair value of restricted stock units vested at March 31, 2025, 2024 and 2023 were as follows (in thousands):
| Fiscal Year Ended March 31,
| 2025 |  | 2024 |  | 2023
Total fair value of restricted stock unit awards vested | $ | 43,733 |  |  | $ | 61,130 |  |  | $ | 61,128 |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the total intrinsic value of options exercised (or share units converted), share-based liabilities paid, and the total fair value of shares vested during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (d)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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