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Concentration of Credit Risk | 9 Months Ended
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Apr. 25, 2015
Risks and Uncertainties [Abstract] |
Concentration of Credit Risk | Concentration of Credit Risk The Company’s customer base is highly concentrated, with its top five customers in each period accounting for approximately 60.1% and 58.5% of its total revenues during the nine months ended April 25, 2015 and April 26, 2014, respectively. Customers whose revenues exceeded 10% of total revenue during the three or nine months ended April 25, 2015 or April 26, 2014 were as follows:
| For the Three Months Ended |  | For the Nine Months Ended
| April 25, 2015 |  | April 26, 2014 |  | April 25, 2015 |  | April 26, 2014
AT&T Inc. | 21.3% |  | 20.8% |  | 21.5% |  | 18.9%
CenturyLink, Inc. | 13.9% |  | 12.8% |  | 13.7% |  | 14.3%
Comcast Corporation | 13.3% |  | 12.1% |  | 13.0% |  | 11.5%
Customers representing 10% or more of combined amounts of trade accounts receivable and costs and estimated earnings in excess of billings, net ("CIEB, net") as of April 25, 2015 or July 26, 2014 had the following outstanding balances and the related percentage of the Company’s total outstanding balances:
| April 25, 2015 |  | July 26, 2014
| Amount |  | % of Total |  | Amount |  | % of Total
|  |  | (Dollars in millions) |  |
AT&T Inc. | $ | 103.5 |  |  | 20.7 | % |  | $ | 87.6 |  |  | 17.9 | %
CenturyLink, Inc. | $ | 56.2 |  |  | 11.2 | % |  | $ | 48.2 |  |  | 9.8 | %
Comcast Corporation | $ | 55.5 |  |  | 11.1 | % |  | $ | 48.9 |  |  | 9.9 | %
In addition, another customer represented $51.0 million, or 10.2%, of combined amounts of trade accounts receivable and CIEB, net as of April 25, 2015 and $20.5 million, or 4.7%, as of July 26, 2014.

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- Definition The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6327-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6442-108592 + Details
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