PURCHASED INTANGIBLE ASSETS - Changes in the Balances of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2023
Change in goodwill
Goodwill, Beginning Balance	$ 27,943
Impairment loss	(7,901)
Acquisition of LTI	90
Goodwill, Ending Balance	28,033
Components of goodwill
Goodwill		$ 36,980
Accumulated impairment losses		(8,947)
Goodwill, net	28,033	28,033
Power Industry Services [Member]
Change in goodwill
Goodwill, Beginning Balance	18,476
Impairment loss	(7,901)
Goodwill, Ending Balance	18,476
Components of goodwill
Goodwill		22,525
Accumulated impairment losses		(4,049)
Goodwill, net	18,476	18,476
Industrial Services
Change in goodwill
Goodwill, Beginning Balance	9,467
Goodwill, Ending Balance	9,467
Components of goodwill
Goodwill		14,365
Accumulated impairment losses		(4,898)
Goodwill, net	9,467	9,467
Telecommunications Infrastructure Services [Member]
Change in goodwill
Acquisition of LTI	90
Goodwill, Ending Balance	90
Components of goodwill
Goodwill		90
Goodwill, net	$ 90	$ 90