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CONVERTIBLE SENIOR NOTES AND CAPPED CALL - Narrative (Details) $ / shares in Units, shares in Millions	1 Months Ended			12 Months Ended
	Dec. 31, 2021 USD ($)	Nov. 30, 2019 USD ($)	Feb. 28, 2019 USD ($) d $ / shares shares	Mar. 31, 2022 USD ($) $ / shares	Mar. 31, 2021 USD ($) $ / shares	Mar. 31, 2020 USD ($)
Debt Instrument [Line Items]
Net proceeds from issuance of convertible senior notes				$ 134,619,000	$ 0	$ 73,918,000
Common stock, par value per share (in dollars per share) | $ / shares				$ 0.001	$ 0.001
Convertible Debt | Convertible Senior Notes
Debt Instrument [Line Items]
Debt instrument, face value	$ 137,500,000		$ 287,500,000	$ 500,000,000	$ 362,500,000
Debt instrument, interest rate	0.50%		0.50%	0.50%
Net proceeds from issuance of convertible senior notes			$ 245,800,000
Debt instrument, convertible, conversion ratio			0.0389484
Common stock, par value per share (in dollars per share) | $ / shares			$ 0.001
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares			$ 25.68
Debt instrument, convertible, threshold trading days | d			20
Debt instrument, convertible, threshold consecutive trading days | d			30
Debt instrument, convertible, threshold percentage of stock price trigger			130.00%
Debt instrument, convertible, measurement period | d			5
Debt instrument, convertible, threshold consecutive trading days preceding measurement period | d			10
Debt instrument, threshold percentage of sales price per share			98.00%
Debt instrument, redemption price, percentage			100.00%
Unamortized debt discount and issuance costs				22 months
Debt instrument, strike price per share (in dollars per share) | $ / shares			$ 25.68
Debt instrument, initial cap price per share (in dollars per share) | $ / shares			$ 39.50
Convertible Debt | Convertible Senior Notes | Call Option
Debt Instrument [Line Items]
Option indexed to issuer's equity, indexed shares (in shares) | shares			14.1
Convertible Debt | First Additional Notes
Debt Instrument [Line Items]
Debt instrument, face value		$ 75,000,000
Debt instrument, interest rate		0.50%
Net proceeds from issuance of convertible senior notes		$ 64,600,000
Conversion option		$ 12,400,000
Debt instrument, effective interest rate			6.50%
Payments for capped call transactions			$ 9,300,000	$ 9,288,000
Convertible Debt | Aggregate Notes
Debt Instrument [Line Items]
Debt instrument, face value	$ 500,000,000.0
Convertible Debt | Initial Notes
Debt Instrument [Line Items]
Conversion option			64,900,000
Payments for capped call transactions			$ 33,700,000	33,724,000
Convertible Debt | Second Additional Notes
Debt Instrument [Line Items]
Debt instrument, face value	$ 137,500,000
Debt instrument, interest rate	0.50%
Net proceeds from issuance of convertible senior notes	$ 134,300,000
Conversion option	$ 15,600,000
Debt instrument, effective interest rate			5.30%
Payments for capped call transactions				$ 0

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