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Quarterly Financial Data (Unaudited) Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Jul. 26, 2014
Quarterly Financial Data [Abstract]  
Schedule of Quarterly Financial Information
Fiscal 2014:
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
 
(Dollars in thousands, except per share amounts)
Revenues
$
512,720

 
$
390,518

 
$
426,284

 
$
482,071

Costs of earned revenues, excluding depreciation and amortization
$
410,119

 
$
327,353

 
$
350,352

 
$
387,221

Gross profit
$
102,601

 
$
63,165

 
$
75,932

 
$
94,850

Net income (loss)
$
18,660

 
$
(3,067
)
 
$
7,895

 
$
16,489

Earnings (loss) per common share - Basic
$
0.56

 
$
(0.09
)
 
$
0.23

 
$
0.49

Earnings (loss) per common share - Diluted
$
0.54

 
$
(0.09
)
 
$
0.23

 
$
0.47


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