CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2022	May 01, 2021
Income Statement [Abstract]
Contract revenues	$ 876,300	$ 727,497
Costs of earned revenues, excluding depreciation and amortization	745,730	620,011
General and administrative	69,380	67,011
Depreciation and amortization	36,637	39,079
Total	851,747	726,101
Interest expense, net	(9,118)	(5,877)
Other income, net	4,795	2,717
Income (loss) before income taxes	20,230	(1,826)
Provision (benefit) for income taxes	694	(2,724)
Net income	$ 19,536	$ 898
Earnings per common share:
Basic earnings per common share (in dollars per share)	$ 0.66	$ 0.03
Diluted earnings per common share (in dollars per share)	$ 0.65	$ 0.03
Shares used in computing earnings per common share:
Basic (in shares)	29,638,833	30,675,625
Diluted (in shares)	30,119,561	31,299,469