INCOME TAXES - Research and Development Tax Credits (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023
INCOME TAXES
Prior period for identify and quantify the amounts of research and development credits	3 years
Research and development tax credit benefit	$ 16,200
Unrecognized income tax benefits related to research and development credits	5,000
Unfavorable tax expense adjustment	6,200
Contract Assets	4,400
Federal research and development tax credits	5,800
Development tax credit			$ 2,400
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	13,700
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	1,400	$ 2,100	$ 2,600
Income tax refunds and prepaid income taxes	$ 30,881	$ 18,267