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Concentration of Credit Risk (Tables) | 6 Months Ended
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Jan. 28, 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 contract revenues exceeded 10% of total contract revenues during the 2018 transition period or fiscal 2017, 2016, or 2015 were as follows:
| Six Months Ended |  | Fiscal Year Ended
| January 27, 2018 |  | July 29, 2017 |  | July 30, 2016 |  | July 25, 2015
Comcast Corporation | 21.6% |  | 17.7% |  | 13.6% |  | 12.9%
AT&T Inc. | 20.6% |  | 26.3% |  | 24.4% |  | 20.8%
CenturyLink, Inc.(1) | 17.5% |  | 18.2% |  | 14.7% |  | 14.5%
Verizon Communications Inc.(2) | 12.0% |  | 9.2% |  | 11.2% |  | 7.7%
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 January 27, 2018, July 29, 2017, or July 30, 2016 were as follows (dollars in millions):
| January 27, 2018 |  | July 29, 2017 |  | July 30, 2016
| Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total
Comcast Corporation | $ | 166.5 |  |  | 24.5% |  | $ | 159.7 |  |  | 21.3% |  | $ | 95.3 |  |  | 13.9%
CenturyLink, Inc.(1) | $ | 126.0 |  |  | 18.5% |  | $ | 148.1 |  |  | 19.8% |  | $ | 81.5 |  |  | 11.9%
Verizon Communications Inc.(2) | $ | 98.2 |  |  | 14.4% |  | $ | 73.7 |  |  | 9.8% |  | $ | 70.2 |  |  | 10.2%
AT&T Inc. | $ | 79.2 |  |  | 11.6% |  | $ | 87.1 |  |  | 11.6% |  | $ | 138.8 |  |  | 20.3%
Windstream Corporation | $ | 42.9 |  |  | 6.3% |  | $ | 84.7 |  |  | 11.3% |  | $ | 79.0 |  |  | 11.5%

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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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