STOCK PLANS (Tables)

12 Months Ended

Mar. 31, 2021

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 employee stock purchases made under the Company's 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,
	2021		2020		2019
Cost of product revenue	$	1,038	$	1,069	$	1,463
Cost of service revenue	5,823		5,774		5,959
Research and development	16,138		15,511		17,321
Sales and marketing	17,328		17,085		18,923
General and administrative	11,565		11,422		12,662
	$	51,892	$	50,861	$	56,328

Summary of Transactions under Amended 2007 and 2019 Equity Incentive Plan

Transactions under the Amended 2007, 2019 Plan and 2019 Amended Plan during the fiscal years ended March 31, 2021, 2020 and 2019 are summarized in the table below.

	Restricted Stock Units
	Number of Awards	Weighted Average Fair Value
Outstanding – March 31, 2018	4,078,780	$	31.77
Granted	2,178,339	30.10
Vested	(1,438,219)	32.49
Canceled	(608,245)	30.52
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

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, 2021, 2020 and 2019 were as follows (in thousands):

	Fiscal Year Ended March 31,
	2021		2020		2019
Total fair value of restricted stock unit awards vested	$	42,510	$	37,783	$	38,070