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Concentration of Credit Risk | 3 Months Ended
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Apr. 28, 2018
Risks and Uncertainties [Abstract] |
Concentration of Credit Risk | The Company’s customer base is highly concentrated, with its top five customers during the three months ended April 28, 2018 and April 29, 2017 accounting for approximately 78.8% and 78.4%, respectively, of its total contract revenues. Customers whose contract revenues exceeded 10% of total contract revenues during the three months ended April 28, 2018 or April 29, 2017, as well as total contract revenues from all other customers combined, were as follows (dollars in millions):
| For the Three Months Ended
| April 28, 2018 |  | April 29, 2017
| Amount |  | % of Total |  | Amount |  | % of Total
AT&T Inc. | $ | 177.0 |  |  | 24.2% |  | $ | 213.1 |  |  | 27.1%
Comcast Corporation | 159.2 |  |  | 21.8 |  | 152.9 |  |  | 19.4
Verizon Communications Inc. | 122.1 |  |  | 16.7 |  | 66.8 |  |  | 8.5
CenturyLink, Inc.(1) | 89.7 |  |  | 12.3 |  | 146.2 |  |  | 18.6
Total other customers combined | 183.4 |  |  | 25.0 |  | 207.3 |  |  | 26.4
Total contract revenues | $ | 731.4 |  |  | 100.0% |  | $ | 786.3 |  |  | 100.0%
(1) For comparison purposes in the table above, amounts from CenturyLink, Inc. and Level 3 Communications, Inc. have been combined for periods prior to their November 2017 merger. See Note 6, Accounts Receivable, Contract Assets, and Contract Liabilities, for information on the Company’s customer credit concentration and collectability of trade accounts receivable and contract assets. Customer Type Total contract revenues by customer type during the three months ended April 28, 2018 and April 29, 2017 were as follows (dollars in millions):
| For the Three Months Ended
| April 28, 2018 |  | April 29, 2017
| Amount |  | % of Total |  | Amount |  | % of Total
Telecommunications | $ | 667.2 |  |  | 91.2% |  | $ | 725.3 |  |  | 92.2%
Underground facility locating | 45.1 |  |  | 6.2 |  | 42.1 |  |  | 5.4
Electrical and gas utilities and other | 19.1 |  |  | 2.6 |  | 18.9 |  |  | 2.4
Total contract revenues | $ | 731.4 |  |  | 100.0% |  | $ | 786.3 |  |  | 100.0%
Remaining Performance Obligations Master service agreements and other contractual agreements with customers contain customer-specified service requirements, such as discrete pricing for individual tasks. In most cases, the Company’s customers are not contractually committed to procure specific volumes of services under these agreements. Services are generally performed pursuant to these agreements in accordance with individual work orders. An individual work order generally is completed within one year or in many cases, less than one week. As a result, the Company’s remaining performance obligations under the work orders not yet completed is not meaningful in relation to the Company’s overall revenue at any given point in time. The Company applies the practical expedient in Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers (“ASC Topic 606”) and does not disclose information about remaining performance obligations that have original expected durations of one year or less.

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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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