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Accounts Receivable (Tables) | 9 Months Ended
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Oct. 26, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Schedule of Accounts Receivable | The Company maintains an allowance for doubtful accounts for estimated losses on uncollected balances. Approximately $16.8 million of the allowance for doubtful accounts as of January 26, 2019 was classified as non-current. The allowance for doubtful accounts changed as follows (dollars in thousands):
| For the Three Months Ended |  | For the Nine Months Ended
| October 26, 2019 |  | October 27, 2018 |  | October 26, 2019 |  | October 27, 2018
Allowance for doubtful accounts at beginning of period | $ | 924 |  |  | $ | 948 |  |  | $ | 17,702 |  |  | $ | 998 |
Provision for bad debt (recovery) | 3,498 |  |  | (36 | ) |  | (7,015 | ) |  | (73 | )
Amounts recovered (charged) against the allowance | 135 |  |  | 34 |  |  | (6,130 | ) |  | 21 |
Allowance for doubtful accounts at end of period | $ | 4,557 |  |  | $ | 946 |  |  | $ | 4,557 |  |  | $ | 946 |
Accounts receivable, net, classified as current, consisted of the following (dollars in thousands):
| October 26, 2019 |  | January 26, 2019
Trade accounts receivable | $ | 408,188 |  |  | $ | 331,903 |
Unbilled accounts receivable | 503,169 |  |  | 283,463 |
Retainage | 12,696 |  |  | 10,831 |
Total | 924,053 |  |  | 626,197 |
Less: allowance for doubtful accounts | (4,557 | ) |  | (939 | )
Accounts receivable, net | $ | 919,496 |  |  | $ | 625,258 |
Contract with Customer, Asset and Liability | Net contract assets consisted of the following (dollars in thousands):
| October 26, 2019 |  | January 26, 2019
Contract assets | $ | 343,191 |  |  | $ | 215,849 |
Contract liabilities | 19,893 |  |  | 15,125 |
Contract assets, net | $ | 323,298 |  |  | $ | 200,724 |
Accounts Receivable Risk | Customers whose combined amounts of accounts receivable and contract assets, net, exceeded 10% of total combined accounts receivable and contract assets, net, as of October 26, 2019 or January 26, 2019 were as follows (dollars in millions):
| October 26, 2019 |  | January 26, 2019
| Amount |  | % of Total |  | Amount |  | % of Total
Verizon Communications Inc. | $ | 511.3 |  |  | 41.1% |  | $ | 298.4 |  |  | 36.2%
CenturyLink, Inc. | $ | 200.9 |  |  | 16.1% |  | $ | 147.2 |  |  | 17.9%
Comcast Corporation | $ | 160.2 |  |  | 12.9% |  | $ | 127.2 |  |  | 15.4%
AT&T Inc. | $ | 111.3 |  |  | 8.9% |  | $ | 90.6 |  |  | 11.0%
Total contract revenues by customer type during the three and nine months ended October 26, 2019 and October 27, 2018 were as follows (dollars in millions):
| For the Three Months Ended |  | For the Nine Months Ended
| October 26, 2019 |  | October 27, 2018 |  | October 26, 2019 |  | October 27, 2018
| Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total
Telecommunications | $ | 798.1 |  |  | 90.3% |  | $ | 773.2 |  |  | 91.1% |  | $ | 2,363.9 |  |  | 90.8% |  | $ | 2,167.1 |  |  | 91.1%
Underground facility locating | 56.0 |  |  | 6.3 |  | 48.8 |  |  | 5.8 |  | 158.0 |  |  | 6.1 |  | 142.9 |  |  | 6.0
Electrical and gas utilities and other | 30.0 |  |  | 3.4 |  | 26.2 |  |  | 3.1 |  | 80.2 |  |  | 3.1 |  | 69.1 |  |  | 2.9
Total contract revenues | $ | 884.1 |  |  | 100.0% |  | $ | 848.2 |  |  | 100.0% |  | $ | 2,602.1 |  |  | 100.0% |  | $ | 2,379.1 |  |  | 100.0%
Customers whose contract revenues exceeded 10% of total contract revenues during the three or nine months ended October 26, 2019 or October 27, 2018, as well as total contract revenues from all other customers combined, were as follows (dollars in millions):
| For the Three Months Ended |  | For the Nine Months Ended
| October 26, 2019 |  | October 27, 2018 |  | October 26, 2019 |  | October 27, 2018
| Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total |  | Amount |  | % of Total
Verizon Communications Inc. | $ | 182.1 |  |  | 20.6% |  | $ | 174.1 |  |  | 20.5% |  | $ | 566.9 |  |  | 21.8% |  | $ | 443.5 |  |  | 18.6%
CenturyLink, Inc. | 164.1 |  |  | 18.6 |  | 118.8 |  |  | 14.0 |  | 412.7 |  |  | 15.9 |  | 316.0 |  |  | 13.3
AT&T Inc. | 162.9 |  |  | 18.4 |  | 164.6 |  |  | 19.4 |  | 555.4 |  |  | 21.3 |  | 506.8 |  |  | 21.3
Comcast Corporation | 131.3 |  |  | 14.9 |  | 176.3 |  |  | 20.8 |  | 401.6 |  |  | 15.4 |  | 506.7 |  |  | 21.3
Total other customers combined | 243.7 |  |  | 27.5 |  | 214.4 |  |  | 25.3 |  | 665.5 |  |  | 25.6 |  | 606.1 |  |  | 25.5
Total contract revenues | $ | 884.1 |  |  | 100.0% |  | $ | 848.2 |  |  | 100.0% |  | $ | 2,602.1 |  |  | 100.0% |  | $ | 2,379.1 |  |  | 100.0%

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