STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION - STOCK-BASED COMPENSATION - BY TYPE (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Stock-Based Compensation Plans
Stock-based compensation expense	$ 14,184	$ 17,103
Equity Settled Awards
Stock-Based Compensation Plans
Stock-based compensation expense	14,192	17,065
Equity Settled Awards | Restricted stock units and restricted stock awards
Stock-Based Compensation Plans
Stock-based compensation expense	15,029	14,890
Equity Settled Awards | Stock Bonus Program and Bonus Share Program
Stock-Based Compensation Plans
Stock-based compensation expense	(837)	2,175
Cash Settled Awards
Stock-Based Compensation Plans
Stock-based compensation expense	$ (8)	$ 38