CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 27, 2018	Oct. 28, 2017	Oct. 27, 2018	Oct. 28, 2017
REVENUES:
Contract revenues	$ 848,237	$ 756,215	$ 2,379,081	$ 2,322,741
EXPENSES:
Costs of earned revenues, excluding depreciation and amortization	687,164	600,847	1,929,113	1,829,220
General and administrative (including stock-based compensation expense of $7.4 million and $7.4 million, respectively)	68,763	64,562	195,601	185,398
Depreciation and amortization	45,533	42,651	133,694	120,306
Total	801,460	708,060	2,258,408	2,134,924
Interest expense, net	(11,310)	(9,707)	(31,922)	(28,824)
Other income, net	2,817	5,931	14,686	16,767
Income before income taxes	38,284	44,379	103,437	175,760
Provision (benefit) for income taxes:
Current	2,366	15,085	13,334	54,415
Deferred	8,088	518	15,142	10,065
Total provision for income taxes	10,454	15,603	28,476	64,480
Net income	$ 27,830	$ 28,776	$ 74,961	$ 111,280
Earnings per common share:
Basic earnings per common share (in dollars per share)	$ 0.89	$ 0.93	$ 2.40	$ 3.57
Diluted earnings per common share (in dollars per share)	$ 0.87	$ 0.90	$ 2.34	$ 3.50
Shares used in computing earnings per common share:
Basic (in shares)	31,246,591	31,061,448	31,214,172	31,167,753
Diluted (in shares)	31,834,542	31,891,574	32,065,229	31,822,106