CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Oct. 28, 2023	Oct. 29, 2022
Income Statement [Abstract]
Contract revenues	$ 1,136,110	$ 1,042,423	$ 3,223,119	$ 2,890,996
Costs of earned revenues, excluding depreciation and amortization	886,662	850,897	2,570,437	2,394,606
General and administrative	87,511	78,798	254,699	221,514
Depreciation and amortization	42,522	35,454	117,786	107,436
Total	1,016,695	965,149	2,942,922	2,723,556
Interest expense, net	(13,952)	(10,592)	(37,601)	(29,057)
Other income, net	6,906	2,474	17,628	9,856
Income before income taxes	112,369	69,156	260,224	148,239
Provision for income taxes	28,633	15,144	64,719	30,835
Net income	$ 83,736	$ 54,012	$ 195,505	$ 117,404
Earnings per common share:
Basic earnings per common share (in dollars per share)	$ 2.85	$ 1.83	$ 6.66	$ 3.97
Diluted earnings per common share (in dollars per share)	$ 2.82	$ 1.80	$ 6.58	$ 3.91
Shares used in computing earnings per common share:
Basic (in shares)	29,334,798	29,524,516	29,344,064	29,561,172
Diluted (in shares)	29,689,316	29,978,795	29,710,603	30,007,257