NET LOSS PER SHARE - Antidilutive Securities (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential anti-dilutive shares (in shares)	11,543	14,211	11,543	14,211
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential anti-dilutive shares (in shares)	1,155	2,210	1,155	2,210
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential anti-dilutive shares (in shares)	9,821	11,472	9,821	11,472
Potential shares attributable to the ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential anti-dilutive shares (in shares)	567	529	567	529