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STOCK PLANS (Tables)
 12 Months Ended
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,
 202520242023
Cost of product revenue$1,296 $1,330 $1,129 
Cost of service revenue8,510 8,899 7,286 
Research and development17,956 19,281 17,055 
Sales and marketing22,765 25,375 22,612 
General and administrative14,258 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, 20224,627,934 $28.23 
Granted3,096,295 33.73 
Vested(1,777,708)28.34 
Canceled(197,050)30.93 
Outstanding – March 31, 20235,749,471 $31.07 
Granted2,446,494 28.87 
Vested(2,067,558)30.08 
Canceled(207,736)31.17 
Outstanding – March 31, 20245,920,671 $30.50 
Granted2,449,057 18.84 
Vested(2,205,063)30.20 
Canceled(418,676)29.02 
Outstanding – March 31, 20255,745,989 $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,
  
202520242023
Total fair value of restricted stock unit awards vested$43,733 $61,130 $61,128