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STOCK PLANS (Tables)
 12 Months Ended
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,
 202220212020
Cost of product revenue$1,022 $1,038 $1,069 
Cost of service revenue6,020 5,823 5,774 
Research and development15,505 16,138 15,511 
Sales and marketing19,684 17,328 17,085 
General and administrative13,843 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, 20194,210,655 $30.84 
Granted2,062,110 26.32 
Vested(1,651,284)31.03 
Canceled(347,008)29.74 
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 
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,
  
202220212020
Total fair value of restricted stock unit awards vested$49,593 $42,510 $37,783