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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Jul. 26, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
Changes in the carrying amount of goodwill for fiscal 2014 and fiscal 2013 are as follows:

 
Goodwill
 
Accumulated Impairment Losses
 
Total
 
(Dollars in thousands)
Balance as of July 28, 2012
$
370,616

 
$
(195,767
)
 
$
174,849

Goodwill from fiscal 2013 acquisitions
92,961

 
—

 
92,961

Balance as of July 27, 2013
463,577

 
(195,767
)
 
267,810

Goodwill from fiscal 2014 acquisitions
1,278

 
—

 
1,278

Balance as of July 26, 2014
$
464,855

 
$
(195,767
)
 
$
269,088
Annual Impairment Analyses
The table below outlines certain assumptions in each of the Company's fiscal 2014, 2013 and 2012 annual quantitative impairment analyses:
 
2014
 
2013
 
2012
Terminal Growth Rate Range
1.5% - 3.0%
 
1.5% - 2.5%
 
1.5% - 3.0%
Discount Rate
11.5%
 
11.5%
 
13.0%
Schedule of Intangible Assets
The Company's intangible assets consist of the following:
 
Weighted Average Remaining Useful Lives
 
July 26,
2014
 
July 27,
2013
 
(Years)
 
(Dollars in thousands)
Carrying amount:
 
 
 
 
 
Customer relationships
11.7
 
$
173,594

 
$
164,497

Contract backlog
1.8
 
15,285

 
15,285

Trade names
4.2
 
8,200

 
8,200

UtiliQuest trade name
—
 
4,700

 
4,700

Non-compete agreements
3.5
 
400

 
400

 
 
 
202,179

 
193,082

Accumulated amortization:
 
 
 

 
 

Customer relationships
 
 
69,048

 
56,219

Contract backlog
 
 
13,490

 
9,433

Trade names
 
 
3,361

 
2,071

Non-compete agreements
 
 
164

 
84


 
 
86,063

 
67,807

Net Intangible Assets
 
 
$
116,116

 
$
125,275
Future Amortization Expense
Estimated total amortization expense for each of the five succeeding fiscal years and thereafter is as follows:
Period
 
Amount
 
 
(Dollars in thousands)
2015
 
$15,946
2016
 
$15,240
2017
 
$13,777
2018
 
$11,616
2019
 
$9,226
Thereafter
 
$45,611