CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2023	Jan. 29, 2022	Jan. 30, 2021
Income Statement [Abstract]
Contract revenues	$ 3,808,462	$ 3,130,519	$ 3,199,165
Costs of earned revenues, excluding depreciation and amortization	3,160,264	2,633,877	2,641,989
General and administrative	293,478	262,432	259,770
Depreciation and amortization	144,181	152,652	175,897
Goodwill impairment charge	0	0	53,264
Total	3,597,923	3,048,961	3,130,920
Interest expense, net	(40,618)	(33,166)	(29,671)
(Loss) gain on debt extinguishment	0	(62)	12,046
Other income, net	10,201	4,446	8,597
Income before income taxes	180,122	52,776	59,217
Provision for income taxes	37,909	4,202	24,880
Net income	$ 142,213	$ 48,574	$ 34,337
Earnings per common share:
Basic earnings per common share (in dollars per share)	$ 4.81	$ 1.60	$ 1.08
Diluted earnings per common share (in dollars per share)	$ 4.74	$ 1.57	$ 1.07
Shares used in computing earnings per common share:
Basic (in shares)	29,549,990	30,337,544	31,665,183
Diluted (in shares)	29,996,591	30,844,211	32,090,578