CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Oct. 27, 2012	Oct. 29, 2011
REVENUES:
Contract revenues	$ 323,286	$ 319,575
EXPENSES:
Costs of earned revenues, excluding depreciation and amortization	257,066	255,187
General and administrative (including stock-based compensation expense of $2.3 million, and $1.3 million, respectively)	28,824	25,358
Depreciation and amortization	15,311	15,958
Total	301,201	296,503
Interest expense, net	(4,197)	(4,173)
Other income, net	1,614	2,959
INCOME BEFORE INCOME TAXES	19,502	21,858
PROVISION FOR INCOME TAXES:
Current	8,858	5,372
Deferred	(1,217)	3,520
Total	7,641	8,892
NET INCOME	$ 11,861	$ 12,966
Earnings Per Common Share:
Basic earnings per common share (in dollars per share)	$ 0.36	$ 0.39
Diluted earnings per common share	$ 0.35	$ 0.38
SHARES USED IN COMPUTING EARNINGS PER COMMON SHARE:
Basic (in shares)	33,089,959	33,508,193
Diluted (in shares)	33,721,070	34,216,451