INCOME TAXES (Details Textuals) - USD ($) $ in Millions	3 Months Ended				6 Months Ended		12 Months Ended
	Apr. 30, 2020	Jan. 31, 2020	Apr. 30, 2019	Jan. 31, 2019	Apr. 30, 2020	Apr. 30, 2019	Jan. 31, 2020
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Percent	22.60%		22.50%		0.30%	14.50%
Tax benefit from stock option exercises recognized in the period		$ 47.6		$ 16.6
Year Over Year, Deferred Tax Expense From Stock Option Exercised							$ 31.0