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Concentration of Credit Risk (Tables) | 9 Months Ended
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Apr. 26, 2014
Risks and Uncertainties [Abstract] |
Schedule that Represents A Significant Portion of the Company’s Customer Base and Each Over 10% of Total Revenue | 10% of total revenue during the three or nine months ended April 26, 2014 or April 27, 2013:
| For the Three Months Ended |  | For the Nine Months Ended
| April 26, 2014 |  | April 27, 2013 |  | April 26, 2014 |  | April 27, 2013
AT&T Inc. ("AT&T") | 20.8% |  | 17.4% |  | 18.9% |  | 15.0%
CenturyLink, Inc. ("CenturyLink") | 12.8% |  | 14.3% |  | 14.3% |  | 14.3%
Comcast Corporation ("Comcast") | 12.1% |  | 10.1% |  | 11.5% |  | 11.2%
Schedule of Customers Representing 10% or More of Combined Amounts of Trade Accounts Receivable and Costs and Estimated Earnings in Excess of Billings with the Following Outstanding Balances and Related Percentages of the Company’s Total Outstanding Balances | Customers representing 10% or more of combined amounts of trade accounts receivable and costs and estimated earnings in excess of billings as of April 26, 2014 or July 27, 2013 had the following outstanding balances and the related percentage of the Company’s total outstanding balances:
| April 26, 2014 |  | July 27, 2013
| Amount |  | % of Total |  | Amount |  | % of Total
|  |  | (Dollars in millions) |  |
AT&T | $ | 73.8 |  |  | 17.1 | % |  | $ | 57.4 |  |  | 12.6 | %
CenturyLink | $ | 46.4 |  |  | 10.7 | % |  | $ | 62.6 |  |  | 13.7 | %
Windstream Corporation | $ | 34.5 |  |  | 8.0 | % |  | $ | 59.4 |  |  | 13.0 | %

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- Definition Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark. + References No definition available. + Details
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- Definition Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark. + 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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