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STOCKHOLDERS' EQUITY - Assumptions Used In Black-Scholes Model (Details) - $ / shares	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	0.00%	41.00%	41.00%
Expected dividend yield	0.00%	0.00%	0.00%
Risk-free interest rate, minimum	0.00%	2.50%	1.80%
Risk-free interest rate, maximum	0.00%	3.00%	2.40%
Weighted average expected term (in years)		4 years 6 months	4 years 9 months 18 days
Weighted average fair value of options granted (in dollars per share)	$ 0	$ 8.19	$ 5.70
Stock Purchase Right
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	32.00%	41.00%	40.00%
Expected dividend yield	0.00%	0.00%	0.00%
Risk-free interest rate	1.79%	2.43%	1.33%
Weighted average expected term (in years)	21 days	24 days	24 days
Weighted average fair value of options granted (in dollars per share)	$ 5.66	$ 5.74	$ 4.10

X

- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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-Publisher FASB
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- Definition

The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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Rate of weighted-average expected volatility for award under share-based payment arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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