CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 28, 2012	Apr. 30, 2011	Apr. 28, 2012	Apr. 30, 2011
REVENUES:
Contract revenues	$ 296,103	$ 252,363	$ 883,085	$ 732,150
EXPENSES:
Costs of earned revenues, excluding depreciation and amortization	241,386	207,045	716,812	597,987
General and administrative (including stock-based compensation expense of $1.9 million and $1.3 million for the three months ended April 28, 2012 and April 30, 2011, respectively, and $4.9 million and $3.1 million for the nine months ended April 28, 2012 and April 30, 2011, respectively.)	26,956	23,678	76,589	68,338
Depreciation and amortization	15,561	15,491	47,047	46,894
Total	283,903	246,214	840,448	713,219
Interest expense	(4,178)	(4,395)	(12,528)	(11,813)
Loss on debt extinguishment	0	(2,557)	0	(8,296)
Other income, net	7,627	3,500	12,943	7,464
INCOME (LOSS) BEFORE INCOME TAXES	15,649	2,697	43,052	6,286
PROVISION (BENEFIT) FOR INCOME TAXES:
Current	5,172	(1,326)	12,626	(1,350)
Deferred	832	2,534	4,330	4,494
Total	6,004	1,208	16,956	3,144
NET INCOME (LOSS)	$ 9,645	$ 1,489	$ 26,096	$ 3,142
EARNINGS PER COMMON SHARE:
Basic earnings (loss) per common share	$ 0.29	$ 0.04	$ 0.78	$ 0.09
Diluted earnings (loss) per common share	$ 0.28	$ 0.04	$ 0.76	$ 0.09
WEIGHTED-AVERAGE SHARES USED IN COMPUTING EARNINGS PER COMMON SHARE:
Basic (in shares)	33,741,255	34,706,822	33,669,974	35,800,175
Diluted (in shares)	34,682,891	35,323,667	34,516,902	36,130,585