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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 29, 2023
Apr. 30, 2022
Income Statement [Abstract]    
Contract revenues $ 1,045,474 $ 876,300
Costs of earned revenues, excluding depreciation and amortization 853,366 745,730
General and administrative 82,357 69,380
Depreciation and amortization 37,271 36,637
Total 972,994 851,747
Interest expense, net (11,372) (9,118)
Other income, net 4,991 4,795
Income before income taxes 66,099 20,230
Provision for income taxes 14,576 694
Net income $ 51,523 $ 19,536
Earnings per common share:    
Basic earnings per common share (in dollars per share) $ 1.75 $ 0.66
Diluted earnings per common share (in dollars per share) $ 1.73 $ 0.65
Shares used in computing earnings per common share:    
Basic (in shares) 29,369,185 29,638,833
Diluted (in shares) 29,782,251 30,119,561