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Quarterly Financial Data (Unaudited) Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Jul. 27, 2013
Quarterly Financial Data [Abstract]  
Schedule of Quarterly Financial Information
Fiscal 2013:
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
 
(Dollars in thousands, except per share amounts)
Revenues
$
323,286

 
$
369,326

 
$
437,367

 
$
478,632

Costs of earned revenues, excluding depreciation and amortization
$
257,066

 
$
301,516

 
$
357,664

 
$
384,169

Gross profit
$
66,220

 
$
67,810

 
$
79,703

 
$
94,463

Net income
$
11,861

 
$
1,463

 
$
7,199

 
$
14,666

Earnings per common share - Basic
$
0.36

 
$
0.04

 
$
0.22

 
$
0.44

Earnings per common share - Diluted
$
0.35

 
$
0.04

 
$
0.21

 
$
0.43


Fiscal 2012:
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
 
(Dollars in thousands, except per share amounts)
Revenues
$
319,575

 
$
267,407

 
$
296,103

 
$
318,034

Costs of earned revenues, excluding depreciation and amortization
$
255,187

 
$
220,239

 
$
241,386

 
$
252,137

Gross profit
$
64,388

 
$
47,168

 
$
54,717

 
$
65,897

Net income
$
12,966

 
$
3,485

 
$
9,645

 
$
13,282

Earnings per common share - Basic
$
0.39

 
$
0.10

 
$
0.29

 
$
0.40

Earnings per common share - Diluted
$
0.38

 
$
0.10

 
$
0.28

 
$
0.39