STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION - RESTRICTED STOCK UNITS (Details) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
Apr. 30, 2020	Apr. 30, 2019
Summary of award activity
Beginning balance (in shares)	2,736	2,777
Granted (in shares)	107	1,444
Released (in shares)	(399)	(448)
Forfeited (in shares)	(81)	(60)
Ending balance (in shares)	2,363	3,713
Weighted-Average Grant-Date Fair Value
Beginning balance (in dollars per share)	$ 52.53	$ 41.05
Granted (in dollars per share)	51.26	61.10
Released (in dollars per share)	46.96	39.50
Forfeited (in dollars per share)	51.84	35.44
Ending balance (in dollars per share)	$ 53.44	$ 49.23
Additional disclosures
Unrecognized compensation expense	$ 70.2
Remaining weighted-average vesting period over which expense is expected to be recognized (in years)	1 year 4 months 24 days

Weighted-average period over which cost not yet recognized is expected to be recognized for 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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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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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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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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