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Concentration of Credit Risk | 6 Months Ended
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Jan. 28, 2017
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 during each of the six months ended January 28, 2017 and January 23, 2016 accounting for approximately 75.5% and 66.7% of its total contract revenues, respectively. Customers whose contract revenues exceeded 10% of total contract revenue during the three or six months ended January 28, 2017 or January 23, 2016 were as follows:
| For the Three Months Ended |  | For the Six Months Ended
| January 28, 2017 |  | January 23, 2016 |  | January 28, 2017 |  | January 23, 2016
AT&T Inc. | 28.3% |  | 22.4% |  | 28.7% |  | 20.6%
Comcast Corporation | 16.7% |  | 13.5% |  | 15.8% |  | 12.7%
CenturyLink, Inc. | 16.5% |  | 14.9% |  | 16.1% |  | 15.3%
Verizon Communications Inc. | 8.8% |  | 11.9% |  | 9.1% |  | 10.7%
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 28, 2017 or July 30, 2016 were as follows (dollars in millions):
| January 28, 2017 |  | July 30, 2016
| Amount |  | % of Total |  | Amount |  | % of Total
Comcast Corporation | $ | 126.4 |  |  | 18.5% |  | $ | 95.3 |  |  | 13.9%
AT&T Inc. | $ | 118.9 |  |  | 17.4% |  | $ | 138.8 |  |  | 20.3%
Windstream Corporation | $ | 97.6 |  |  | 14.3% |  | $ | 79.0 |  |  | 11.5%
CenturyLink, Inc. | $ | 79.7 |  |  | 11.7% |  | $ | 79.0 |  |  | 11.5%
Verizon Communications Inc. | $ | 63.2 |  |  | 9.3% |  | $ | 69.0 |  |  | 10.1%
In addition, another customer had combined amounts of trade accounts receivable and CIEB, net of $75.6 million, or 11.1%, as of January 28, 2017, and $71.5 million, or 10.4%, as of July 30, 2016. The Company believes that none of its significant customers were experiencing financial difficulties that would materially impact the collectability of the Company’s trade accounts receivable and costs in excess of billings as of January 28, 2017. See Note 4, Accounts Receivable, and Note 5, Costs and Estimated Earnings in Excess of Billings, for additional information regarding the Company’s trade accounts receivable and costs and estimated earnings in excess of billings.

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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=64851502&loc=d3e6327-108592 Reference 2: 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 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=64851502&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=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 18 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 6: 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 + Details
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