FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS - OPTION TO ACQUIRE NONCONTROLLING INTERESTS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018	Jan. 31, 2019
Changes in the estimated fair value of liability for contingent consideration measured using significant unobservable inputs (Level 3)
Change in fair value, recorded in operating expenses	$ 800	$ 3,900	$ (400)	$ 4,700
Option to Acquire Noncontrolling Interests
Liability for contingent consideration measured using significant unobservable inputs (Level 3)
Fair Value Measurement Input - Discount Rate			11.50%		12.50%
Changes in the estimated fair value of liability for contingent consideration measured using significant unobservable inputs (Level 3)
Fair value measurement at the beginning of the period			$ 3,000	2,950	$ 2,950
Change in fair value, recorded in operating expenses			(50)	(50)
Fair value measurement at the end of the period	$ 2,950	$ 2,900	$ 2,950	$ 2,900	$ 3,000