PURCHASED INTANGIBLE ASSETS - Changes in the balances of goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 27,943	$ 27,943	$ 32,838
Impairment loss	(7,901)		(4,895)
Acquisition of LTI	90
Goodwill, Ending Balance	28,033	27,943	27,943
GPS
Goodwill [Roll Forward]
Goodwill, Beginning Balance	18,476	18,476	18,476
Goodwill, Ending Balance	18,476	18,476	18,476
TRC
Goodwill [Roll Forward]
Goodwill, Beginning Balance	9,467	9,467	12,290
Impairment loss			(2,823)
Goodwill, Ending Balance	9,467	9,467	9,467
APC
Goodwill [Roll Forward]
Goodwill, Beginning Balance			2,072
Impairment loss		$ (2,100)	$ (2,072)
SMC
Goodwill [Roll Forward]
Acquisition of LTI	90
Goodwill, Ending Balance	$ 90