STOCK-BASED COMPENSATION - EMPLOYEE STOCK PURCHASE PLAN (Details) - 2017 Global Employee Stock Purchase Plan - Employee Stock Purchase Plan $ / shares in Units, shares in Thousands	12 Months Ended
Mar. 31, 2019 USD ($) $ / shares shares
Stock-based compensation
Expected service period (years)	6 months
Dividends \| $	$ 0
Shares reserved for future issuance	9,000
Shares available for issuance	8,943
Employee payroll deduction, minimum	1.00%
Employee payroll deduction, maximum	10.00%
ESPP shares purchased by employees (in shares)	57
ESPP shares purchased by employees \| $	$ 5,069,000
Weighted-average fair value of shares purchased by employees (usd per share) \| $ / shares	$ 88.66
Minimum
Stock-based compensation
Risk-free interest rate	2.10%
Expected stock price volatility	39.10%
Maximum
Stock-based compensation
Risk-free interest rate	2.50%
Expected stock price volatility	40.00%

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Share-based Compensation Arrangement by Share-based Payment Award, Minimum Employee Subscription Rate

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Aggregate number of common shares reserved for future issuance.

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The estimated amount of dividends to be paid to holders of the underlying shares (expected dividends) over the option's term. Dividends are taken into account because payment of dividends to shareholders reduces the fair value of the underlying shares, and option holders generally do not receive dividends.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.

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