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STOCK PLANS (Tables)
 12 Months Ended
Mar. 31, 2023
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, the 2019 Amended Plan, and the 2019 Second Amended Plan, and employee stock purchases made under the Company's 2011 Amended and Restated Employee Stock Purchase Plan (ESPP), based on estimated fair values within the applicable cost and expense lines identified below (in thousands):
 Fiscal Year Ended March 31,
 202320222021
Cost of product revenue$1,129 $1,022 $1,038 
Cost of service revenue7,286 6,020 5,823 
Research and development17,055 15,505 16,138 
Sales and marketing22,612 19,684 17,328 
General and administrative13,904 13,843 11,565 
$61,986 $56,074 $51,892 
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity Transactions under the Amended 2007, 2019 Plan, the 2019 Amended Plan, and the 2019 Second Amended Plan during the fiscal years ended March 31, 2023, 2022 and 2021 are summarized in the table below.
 Restricted Stock Units
 Number of
Awards		Weighted
Average
Fair Value
Outstanding – March 31, 20204,274,473 $28.68 
Granted2,038,681 27.42 
Vested(1,630,228)28.63 
Canceled(187,313)28.28 
Outstanding – March 31, 20214,495,613 $28.14 
Granted2,121,937 29.06 
Vested(1,728,994)29.04 
Canceled(260,622)28.07 
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 
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, 2023, 2022 and 2021 were as follows (in thousands):
 Fiscal Year Ended March 31,
  
202320222021
Total fair value of restricted stock unit awards vested$61,128 $49,593 $42,510