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STOCK PLANS (Tables) | 12 Months Ended
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Mar. 31, 2022
Share-based Payment Arrangement [Abstract] |
Summary 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, the 2019 Plan, and the 2019 Amended Plan and employee stock purchases made under the Company's 2011 Employee Stock Purchase Plan, as amended, (ESPP), based on estimated fair values within the applicable cost and expense lines identified below (in thousands):
| Fiscal Year Ended March 31,
| 2022 |  | 2021 |  | 2020
Cost of product revenue | $ | 1,022 |  |  | $ | 1,038 |  |  | $ | 1,069 |
Cost of service revenue | 6,020 |  |  | 5,823 |  |  | 5,774 |
Research and development | 15,505 |  |  | 16,138 |  |  | 15,511 |
Sales and marketing | 19,684 |  |  | 17,328 |  |  | 17,085 |
General and administrative | 13,843 |  |  | 11,565 |  |  | 11,422 |
| $ | 56,074 |  |  | $ | 51,892 |  |  | $ | 50,861 |
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity | Transactions under the Amended 2007, 2019 Plan and 2019 Amended Plan during the fiscal years ended March 31, 2022, 2021 and 2020 are summarized in the table below.
|  |  | Restricted Stock Units
|  |  |  |  | Number of Awards |  | Weighted Average Fair Value
Outstanding – March 31, 2019 |  |  |  |  | 4,210,655 |  |  | $ | 30.84 |
Granted |  |  |  |  | 2,062,110 |  |  | 26.32 |
Vested |  |  |  |  | (1,651,284) |  |  | 31.03 |
Canceled |  |  |  |  | (347,008) |  |  | 29.74 |
Outstanding – March 31, 2020 |  |  |  |  | 4,274,473 |  |  | $ | 28.68 |
Granted |  |  |  |  | 2,038,681 |  |  | 27.42 |
Vested |  |  |  |  | (1,630,228) |  |  | 28.63 |
Canceled |  |  |  |  | (187,313) |  |  | 28.28 |
Outstanding – March 31, 2021 |  |  |  |  | 4,495,613 |  |  | $ | 28.14 |
Granted |  |  |  |  | 2,121,937 |  |  | 29.06 |
Vested |  |  |  |  | (1,728,994) |  |  | 29.04 |
Canceled |  |  |  |  | (260,622) |  |  | 28.07 |
Outstanding – March 31, 2022 |  |  |  |  | 4,627,934 |  |  | $ | 28.23 |
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, 2022, 2021 and 2020 were as follows (in thousands):
| Fiscal Year Ended March 31,
| 2022 |  | 2021 |  | 2020
Total fair value of restricted stock unit awards vested | $ | 49,593 |  |  | $ | 42,510 |  |  | $ | 37,783 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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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