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Concentration of Credit Risk | 12 Months Ended
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Jan. 26, 2019
Risks and Uncertainties [Abstract] |
Concentration of Credit Risk | Customer Concentration and Revenue Information Geographic Location The Company provides services throughout the United States and previously in Canada. Revenues from services provided in Canada were not material during fiscal 2019, the 2018 transition period, fiscal 2017, or fiscal 2016. Significant Customers The Company’s customer base is highly concentrated, with its top five customers accounting for approximately 78.4%, 75.8%, 76.8%, and 70.1%, of its total contract revenues during fiscal 2019, the 2018 transition period, fiscal 2017, and fiscal 2016, respectively. Customers whose contract revenues exceeded 10% of total contract revenues during fiscal 2019, the 2018 transition period, fiscal 2017, or fiscal 2016, as well as total contract revenues from all other customers combined, were as follows:
| Fiscal Year Ended |  | Six Months Ended |  | Fiscal Year Ended
| January 26, 2019 |  | January 27, 2018 |  | July 29, 2017 |  | July 30, 2016
| Amount | % of Total |  | Amount | % of Total |  | Amount | % of Total |  | Amount | % of Total
AT&T Inc. | 664.2 | 21.2% |  | 290.1 | 20.6% |  | 806.7 | 26.3% |  | 650.9 | 24.4%
Comcast Corporation | 650.2 | 20.8% |  | 304.4 | 21.6% |  | 543.6 | 17.7% |  | 363.1 | 13.6%
Verizon Communications Inc.(1) | 599.8 | 19.2% |  | 168.7 | 12.0% |  | 282.7 | 9.2% |  | 298.2 | 11.2%
Century Link, Inc.(2) | 425.6 | 13.6% |  | 247.0 | 17.5% |  | 556.8 | 18.2% |  | 394.0 | 14.7%
Total other customers combined | 787.9 | 25.2% |  | 401.1 | 28.3% |  | 877.1 | 28.6% |  | 966.3 | 36.1%
Total contract revenues | $ | 3,127.7 |  | 100.0% |  | 1,411.3 | 100% |  | 3,066.9 | 100.0% |  | 2,672.5 | 100%
(1) For comparison purposes in the table above, amounts from Verizon Communications Inc. and XO Communications LLC’s fiber-optic network business have been combined for periods prior to their February 2017 merger. (2) 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. On February 25, 2019, Windstream, the Company’s fifth largest customer with contract revenues of $113.6 million during fiscal 2019, filed a voluntary petition under Chapter 11 of the United States Bankruptcy Code in the U.S. Bankruptcy Court for the Southern District of New York. The Company expects to continue to provide services to Windstream pursuant to existing contractual obligations but the amount of services performed in the future could be reduced or eliminated. Customer Type Total contract revenues by customer type during fiscal 2019, the 2018 transition period, fiscal 2017, and fiscal 2016 were as follows (dollars in millions):
| Fiscal Year Ended |  | Six Months Ended |  | Fiscal Year Ended
| January 26, 2019 |  | January 27, 2018 |  | July 29, 2017 |  | July 30, 2016
| Amount | % of Total |  | Amount | % of Total |  | Amount | % of Total |  | Amount | % of Total
Telecommunications | $ | 2,855.8 |  | 91.3% |  | $ | 1,284.1 |  | 91.0% |  | $ | 2,819.9 |  | 91.9% |  | $ | 2,424.2 |  | 90.7%
Underground facility locating | $ | 182.7 |  | 5.8% |  | $ | 88.6 |  | 6.3% |  | $ | 167.9 |  | 5.5% |  | $ | 156.7 |  | 5.9%
Electrical and gas utilities and other | $ | 89.2 |  | 2.9% |  | $ | 38.6 |  | 2.7% |  | $ | 79.1 |  | 2.6% |  | $ | 91.6 |  | 3.4%
Total contract revenues | $ | 3,127.7 |  | 100% |  | $ | 1,411.3 |  | 100% |  | $ | 3,066.9 |  | 100% |  | $ | 2,672.5 |  | 100%
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 Topic 606, Revenue from Contracts with Customers, 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -URI http://asc.fasb.org/topic&trid=2134479 + Details
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