CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 28, 2018	Jul. 29, 2017	Jul. 28, 2018	Jul. 29, 2017
REVENUES:
Contract revenues	$ 799,470	$ 780,188	$ 1,530,844	$ 1,566,526
EXPENSES:
Costs of earned revenues, excluding depreciation and amortization	642,376	606,898	1,241,949	1,228,373
General and administrative (including stock-based compensation expense of $6.0 million and $4.9 million, respectively)	64,555	59,519	126,838	120,836
Depreciation and amortization	44,805	40,244	88,160	77,655
Total	751,736	706,661	1,456,947	1,426,864
Interest expense, net	(10,446)	(9,735)	(20,612)	(19,117)
Other income, net	4,156	6,043	11,868	10,836
Income before income taxes	41,444	69,835	65,153	131,381
Provision (benefit) for income taxes:
Current	9,872	13,811	10,967	39,330
Deferred	1,672	12,316	7,055	9,547
Total provision for income taxes	11,544	26,127	18,022	48,877
Net income	$ 29,900	$ 43,708	$ 47,131	$ 82,504
Earnings per common share:
Basic earnings per common share (in dollars per share)	$ 0.96	$ 1.41	$ 1.51	$ 2.64
Diluted earnings per common share (in dollars per share)	$ 0.94	$ 1.38	$ 1.46	$ 2.60
Shares used in computing earnings per common share:
Basic (in shares)	31,206,340	31,084,019	31,198,349	31,220,719
Diluted (in shares)	31,954,013	31,664,148	32,180,960	31,787,185