STOCK PLANS AND STOCK-BASED COMPENSATION Valuation Assumptions (Details) - $ / shares	12 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility		29.10%	31.10%
Risk-free interest rate		1.70%	1.10%
Expected dividends		1.20%	1.40%
Expected life (in years)		4 years 7 months 6 days	4 years 146 days
Weighted-average grant date fair value (in dollars per share)		$ 12.58	$ 10.39
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	40.80%	30.50%	28.80%
Risk-free interest rate	2.40%	1.50%	0.60%
Expected dividends	1.10%	1.20%	1.10%
Expected life (in years)	6 months	6 months	183 days
Weighted-average grant date fair value (in dollars per share)	$ 14.44	$ 11.78	$ 12.03

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.

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- Definition

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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- Definition

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

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- Definition

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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No definition available.

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- Definition

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

+ 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)(i)
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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