CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Jan. 27, 2024	Jan. 28, 2023	Jan. 29, 2022
Income Statement [Abstract]
Contract revenues	$ 4,175,574	$ 3,808,462	$ 3,130,519
Costs of earned revenues, excluding depreciation and amortization	3,361,815	3,160,264	2,633,877
General and administrative	327,674	293,478	262,432
Depreciation and amortization	163,092	144,181	152,652
Total	3,852,581	3,597,923	3,048,961
Interest expense, net	(52,603)	(40,618)	(33,166)
Loss on debt extinguishment	0	0	(62)
Other income, net	21,609	10,201	4,446
Income before income taxes	291,999	180,122	52,776
Provision for income taxes	73,076	37,909	4,202
Net income	$ 218,923	$ 142,213	$ 48,574
Earnings per common share:
Basic earnings per common share (in dollars per share)	$ 7.46	$ 4.81	$ 1.60
Diluted earnings per common share (in dollars per share)	$ 7.37	$ 4.74	$ 1.57
Shares used in computing earnings per common share:
Basic (in shares)	29,333,054	29,549,990	30,337,544
Diluted (in shares)	29,698,926	29,996,591	30,844,211