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Concentration of Credit Risk (Tables) | 9 Months Ended
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Apr. 27, 2013
Risks and Uncertainties [Abstract] |
Schedule that Represents A Significant Portion of the Company’s Customer Base and Each Over 10% of Total Revenue | AT&T Inc. ("AT&T"), CenturyLink, Inc. ("CenturyLink"), Comcast Corporation ("Comcast"), and Verizon Communications, Inc. ("Verizon") represent a significant portion of the Company’s customer base and each were over 10% of total revenue during the three or nine months ended April 27, 2013 or April 28, 2012 as reflected in the following table:
| For the Three Months Ended | For the Nine Months Ended
| April 27, 2013 |  | April 28, 2012 |  | April 27, 2013 |  | April 28, 2012
AT&T | 17.4% |  | 13.4% |  | 15.0% |  | 14.1%
CenturyLink | 14.3% |  | 13.0% |  | 14.3% |  | 13.6%
Comcast | 10.1% |  | 12.5% |  | 11.2% |  | 12.7%
Verizon | 8.9% |  | 11.1% |  | 9.3% |  | 11.0%
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 27, 2013 or July 28, 2012 had the following outstanding balances and the related percentage of the Company’s total outstanding balances:
| April 27, 2013 |  | July 28, 2012
| Amount |  | % of Total |  | Amount |  | % of Total
|  |  | (Dollars in millions) |  |
AT&T | $ | 53.3 |  |  | 12.7 | % |  | $ | 24.7 |  |  | 9.2 | %
CenturyLink | $ | 51.8 |  |  | 12.4 | % |  | $ | 47.6 |  |  | 17.7 | %
Verizon | $ | 41.6 |  |  | 10.0 | % |  | $ | 30.5 |  |  | 11.3 | %
Windstream Corporation | $ | 61.8 |  |  | 14.8 | % |  | $ | 35.4 |  |  | 13.2 | %

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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 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 Reference 2: 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=7491637&loc=d3e13537-108611 Reference 3: 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 4: 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 Reference 5: 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 6: 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=7491637&loc=d3e13531-108611 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-6 -Paragraph 21, 22, 23, 24, 25 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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