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Concentration of Credit Risk (Tables) | 9 Months Ended
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Apr. 29, 2017
Risks and Uncertainties [Abstract] |
Schedule that Represents A Significant Portion of the Company’s Customer Base and Each Over 10% of Total Revenue | Customers whose combined amounts of trade accounts receivable and costs and estimated earnings in excess of billings, net (“CIEB, net”) exceeded 10% of total combined trade receivables and CIEB, net as of April 29, 2017 or July 30, 2016 were as follows (dollars in millions):
| April 29, 2017 |  | July 30, 2016
| Amount |  | % of Total |  | Amount |  | % of Total
Comcast Corporation | $ | 172.5 |  |  | 22.4% |  | $ | 95.3 |  |  | 13.9%
CenturyLink, Inc. | $ | 118.4 |  |  | 15.4% |  | $ | 79.0 |  |  | 11.5%
AT&T Inc. | $ | 109.5 |  |  | 14.2% |  | $ | 138.8 |  |  | 20.3%
Windstream Corporation | $ | 89.5 |  |  | 11.6% |  | $ | 79.0 |  |  | 11.5%
Verizon Communications Inc.(1) | $ | 63.0 |  |  | 8.2% |  | $ | 70.2 |  |  | 10.2%
Customers whose contract revenues exceeded 10% of total contract revenue during the three or nine months ended April 29, 2017 or April 23, 2016 were as follows:
| For the Three Months Ended |  | For the Nine Months Ended
| April 29, 2017 |  | April 23, 2016 |  | April 29, 2017 |  | April 23, 2016
AT&T Inc. | 27.1% |  | 26.8% |  | 28.1% |  | 22.8%
Comcast Corporation | 19.4% |  | 14.4% |  | 17.1% |  | 13.3%
CenturyLink, Inc. | 17.7% |  | 13.7% |  | 16.6% |  | 14.7%
Verizon Communications Inc.(1) | 8.5% |  | 10.6% |  | 8.9% |  | 10.7%

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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=64851502&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=73719730&loc=d3e13537-108611 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=73719730&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 21 -URI http://asc.fasb.org/extlink&oid=64851502&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=64851502&loc=d3e6327-108592 Reference 6: 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=64851502&loc=d3e6404-108592 + Details
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