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STOCK-BASED COMPENSATION - Schedule of Weighted-Average Assumptions for Options and ESPP Subscriptions Granted Granted (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average risk-free interest rate	2.80%	1.80%	2.90%	1.80%
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Expected volatility (as a percent)	29.20%	33.20%	29.10%	33.00%
Expected term	5 years 2 months 12 days	4 years 8 months 12 days	5 years	4 years 7 months 6 days
Fair value, per option (in dollars per share)	$ 46.37	$ 36.26	$ 42.44	$ 33.74
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average risk-free interest rate	1.20%	0.70%	0.90%	0.50%
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Expected volatility (as a percent)	34.30%	34.30%	32.80%	33.10%
Expected term	8 months 12 days	8 months 12 days	7 months 6 days	7 months 6 days
Fair value, per option (in dollars per share)	$ 46.58	$ 29.15	$ 36.53	$ 25.69

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.

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

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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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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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