CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Share data	3 Months Ended
	Oct. 29, 2011	Oct. 30, 2010
REVENUES:
Contract revenues	$ 319,575	$ 261,584
EXPENSES:
Costs of earned revenues, excluding depreciation and amortization	255,187	209,322
General and administrative (including stock-based compensation expense of $1.3 million and $0.8 million, respectively)	25,358	22,825
Depreciation and amortization	15,958	15,616
Total	296,503	247,763
Interest income	17	28
Interest expense	4,190	3,707
Other income, net	2,959	1,757
INCOME BEFORE INCOME TAXES	21,858	11,899
PROVISION (BENEFIT) FOR INCOME TAXES:
Current	5,372	4,602
Deferred	3,520	550
Total	8,892	5,152
NET INCOME	$ 12,966	$ 6,747
EARNINGS PER COMMON SHARE:
Basic earnings per common share (in dollars per share)	$ 0.39	$ 0.18
Diluted earnings per common share (in dollars per share)	$ 0.38	$ 0.18
WEIGHTED-AVERAGE SHARES USED IN COMPUTING EARNINGS PER COMMON SHARE:
Basic (in shares)	33,508,193	37,465,142
Diluted (in shares)	34,216,451	37,567,946