INTANGIBLE ASSETS - Changes in the Balances of Goodwill (Details) - USD ($) $ in Thousands	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023
Components of goodwill
Goodwill	$ 36,980
Accumulated impairment losses	(8,947)
Goodwill, net	28,033	$ 28,033	$ 28,033
Power Services
Components of goodwill
Goodwill	22,525
Accumulated impairment losses	(4,049)
Goodwill, net	18,476	18,476	18,476
Industrial Services
Components of goodwill
Goodwill	14,365
Accumulated impairment losses	(4,898)
Goodwill, net	9,467	9,467	9,467
Telecom Services
Components of goodwill
Goodwill	90
Goodwill, net	$ 90	$ 90	$ 90