CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 27, 2019	Jul. 28, 2018	Jul. 27, 2019	Jul. 28, 2018
REVENUES:
Contract revenues	$ 884,221	$ 799,470	$ 1,717,964	$ 1,530,844
EXPENSES:
Costs of earned revenues, excluding depreciation and amortization	720,382	642,376	1,422,150	1,241,949
General and administrative	65,117	64,555	123,738	126,838
Depreciation and amortization	47,244	44,805	93,586	88,160
Costs and Expenses	832,743	751,736	1,639,474	1,456,947
Interest expense, net	(12,878)	(10,446)	(25,111)	(20,612)
Other income, net	(4,006)	(4,156)	(9,705)	(11,868)
Income before income taxes	42,606	41,444	63,084	65,153
Provision (benefit) for income taxes:
Total provision for income taxes	12,710	11,544	18,909	18,022
Net income	$ 29,896	$ 29,900	$ 44,175	$ 47,131
Earnings per common share:
Basic earnings per common share (in dollars per share)	$ 0.95	$ 0.96	$ 1.40	$ 1.51
Diluted earnings per common share (in dollars per share)	$ 0.94	$ 0.94	$ 1.39	$ 1.46
Shares used in computing earnings per common share:
Basic (in shares)	31,487,011	31,206,340	31,469,401	31,198,349
Diluted (in shares)	31,820,296	31,954,013	31,803,368	32,180,960