CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jul. 28, 2012	Apr. 28, 2012	Jan. 28, 2012	Oct. 29, 2011	Jul. 30, 2011	Apr. 30, 2011	Jan. 29, 2011	Oct. 30, 2010	Jul. 28, 2012	Jul. 30, 2011	Jul. 31, 2010
REVENUES:
Contract revenues	$ 318,034	$ 296,103	$ 267,407	$ 319,575	$ 303,719	$ 252,363	$ 218,203	$ 261,584	$ 1,201,119	$ 1,035,868	$ 988,623
EXPENSES:
Costs of earned revenues, excluding depreciation and amortization	252,137	241,386	220,239	255,187	239,132	207,045	181,621	209,322	968,949	837,119	810,064
General and administrative (including stock-based compensation expense of $7.0 million, $4.4 million, and $3.4 million respectively.)									104,024	94,622	98,140
Depreciation and amortization									62,693	62,533	63,607
Total									1,135,666	994,274	971,811
Interest expense, net									(16,717)	(15,911)	(14,175)
Loss on debt extinguishment									0	(8,295)	0
Other income, net									15,825	11,096	8,093
INCOME BEFORE INCOME TAXES									64,561	28,484	10,730
PROVISION (BENEFIT) FOR INCOME TAXES:
Current									15,309	(2,351)	2,960
Deferred									9,874	14,728	1,921
Total									25,183	12,377	4,881
NET INCOME	$ 13,282	$ 9,645	$ 3,485	$ 12,966	$ 12,965	$ 1,489	$ (5,094)	$ 6,747	$ 39,378	$ 16,107	$ 5,849
EARNINGS PER COMMON SHARE:
Basic earnings per common share (in dollars per share)	$ 0.40	$ 0.29	$ 0.10	$ 0.39	$ 0.38	$ 0.04	$ (0.14)	$ 0.18	$ 1.17	$ 0.46	$ 0.15
Diluted earnings per common share (in dollars per share)	$ 0.39	$ 0.28	$ 0.10	$ 0.38	$ 0.38	$ 0.04	$ (0.14)	$ 0.18	$ 1.14	$ 0.45	$ 0.15
SHARES USED IN COMPUTING EARNINGS PER COMMON SHARE:
Basic (in shares)									33,653,055	35,306,900	38,931,029
Diluted (in shares)									34,481,895	35,754,168	38,996,866