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Concentration of Credit Risk | 3 Months Ended
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Oct. 26, 2013
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 of the three months ended October 26, 2013 and October 27, 2012, accounting for approximately 57.2% and 59.6% of its total revenues, respectively. Revenues from four of the top five customers exceeded 10% of total revenue during the three months ended October 26, 2013 or October 27, 2012:
| For the Three Months Ended
| October 26, 2013 |  | October 27, 2012
AT&T Inc. ("AT&T") | 17.5% |  | 13.5%
CenturyLink, Inc. ("CenturyLink") | 15.5% |  | 13.7%
Comcast Corporation ("Comcast") | 10.5% |  | 12.7%
Verizon Communications, Inc. ("Verizon") | 8.4% |  | 10.2%
The Company believes that none of its significant customers was experiencing financial difficulties that would materially impact the collectability of the Company’s trade accounts receivable and costs in excess of billings as of October 26, 2013. Customers representing 10% or more of combined amounts of trade accounts receivable and costs and estimated earnings in excess of billings as of October 26, 2013 or July 27, 2013 had the following outstanding balances and the related percentage of the Company’s total outstanding balances:
| October 26, 2013 |  | July 27, 2013
| Amount |  | % of Total |  | Amount |  | % of Total
|  |  | (Dollars in millions) |  |
AT&T | $ | 69.0 |  |  | 13.1 | % |  | $ | 57.4 |  |  | 12.6 | %
CenturyLink | $ | 66.5 |  |  | 12.6 | % |  | $ | 62.6 |  |  | 13.7 | %
Verizon | $ | 54.8 |  |  | 10.4 | % |  | $ | 33.4 |  |  | 7.3 | %
Windstream Corporation | $ | 51.4 |  |  | 9.8 | % |  | $ | 59.4 |  |  | 13.0 | %

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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=28364263&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=28364263&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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