STOCK-BASED COMPENSATION - STOCK ACTIVITY (Details) - USD ($) $ / shares in Units, shares in Thousands	12 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Employee Market-Based
Weighted-average assumptions
Risk-free interest rate	1.80%	2.60%	1.40%
Expected stock price volatility	39.40%	34.90%	28.40%
Expected service period (years)	1 year 6 months	1 year 6 months	1 year 6 months
Dividends	$ 0	$ 0	$ 0
Non-Employee Market-Based
Weighted-average assumptions
Risk-free interest rate	2.40%	2.40%	2.10%
Expected stock price volatility	39.90%	31.40%	35.50%
Expected service period (years)	1 year	1 year	1 year
Dividends	$ 0	$ 0	$ 0
Time-based
Shares
Non-vested restricted stock units at the beginning of the year (in shares)	2,603
Granted (in shares)	668
Vested (in shares)	(1,243)
Forfeited (in shares)	(68)
Non-vested restricted stock units at the end of the year (in shares)	1,960	2,603
Weighted Average Fair Value on Grant Date
Non-vested restricted stock at the beginning of the year (in dollars per share)	$ 95.35
Granted (in dollars per share)	113.18
Vested (in dollars per share)	94.86
Forfeited (in dollars per share)	106.08
Non-vested restricted stock at the end of the year (in dollars per share)	$ 99.54	$ 95.35
Market-based restricted shares
Shares
Non-vested restricted stock units at the beginning of the year (in shares)	466
Granted (in shares)	403
Vested (in shares)	(489)
Forfeited (in shares)	(22)
Non-vested restricted stock units at the end of the year (in shares)	358	466
Weighted Average Fair Value on Grant Date
Non-vested restricted stock at the beginning of the year (in dollars per share)	$ 123.72
Granted (in dollars per share)	170.18
Vested (in dollars per share)	125.63
Forfeited (in dollars per share)	138.10
Non-vested restricted stock at the end of the year (in dollars per share)	$ 157.05	$ 123.72
Performance Based Awards
Shares
Non-vested restricted stock units at the beginning of the year (in shares)	3,000
Granted (in shares)	500
Vested (in shares)	(233)
Forfeited (in shares)	(28)
Non-vested restricted stock units at the end of the year (in shares)	3,239	3,000
Weighted Average Fair Value on Grant Date
Non-vested restricted stock at the beginning of the year (in dollars per share)	$ 99.37
Granted (in dollars per share)	125.66
Vested (in dollars per share)	109.64
Forfeited (in dollars per share)	101.49
Non-vested restricted stock at the end of the year (in dollars per share)	$ 119.97	$ 99.37

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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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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