CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 30, 2022	Jul. 31, 2021	Jul. 30, 2022	Jul. 31, 2021
Income Statement [Abstract]
Contract revenues	$ 972,273	$ 787,568	$ 1,848,573	$ 1,515,065
Costs of earned revenues, excluding depreciation and amortization	797,980	651,367	1,543,710	1,271,378
General and administrative	73,336	64,730	142,716	131,740
Depreciation and amortization	35,345	38,462	71,981	77,542
Total	906,661	754,559	1,758,407	1,480,660
Interest expense, net	(9,347)	(9,334)	(18,465)	(15,211)
Other income, net	2,587	986	7,381	3,703
Income before income taxes	58,852	24,661	79,082	22,835
Provision for income taxes	14,996	6,496	15,690	3,772
Net income	$ 43,856	$ 18,165	$ 63,392	$ 19,063
Earnings per common share:
Basic earnings per common share (in dollars per share)	$ 1.48	$ 0.60	$ 2.14	$ 0.62
Diluted earnings per common share (in dollars per share)	$ 1.46	$ 0.59	$ 2.11	$ 0.61
Shares used in computing earnings per common share:
Basic (in shares)	29,540,174	30,431,143	29,579,498	30,553,381
Diluted (in shares)	29,943,422	30,872,506	30,021,486	31,085,985