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Accounts Receivable (Tables) | 3 Months Ended
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Apr. 27, 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. During the three months ended April 27, 2019, the Company recognized a $10.3 million recovery of previously reserved accounts receivable and contract assets based on collections from a customer. The allowance for doubtful accounts changed as follows (dollars in thousands):
| For the Three Months Ended
| April 27, 2019 |  | April 28, 2018
Allowance for doubtful accounts at beginning of period | $ | 17,702 |  |  | $ | 998 |
Provision for bad debt (recovery) | (10,311 | ) |  | (24 | )
Amounts (charged) recovered against the allowance | (6,019 | ) |  | 2 |
Allowance for doubtful accounts at end of period | $ | 1,372 |  |  | $ | 976 |
Accounts receivable, net classified as current consisted of the following (dollars in thousands):
| April 27, 2019 |  | January 26, 2019
Trade accounts receivable | $ | 299,572 |  |  | $ | 331,903 |
Unbilled accounts receivable | 393,198 |  |  | 283,463 |
Retainage | 10,124 |  |  | 10,831 |
Total | 702,894 |  |  | 626,197 |
Less: allowance for doubtful accounts | (1,372 | ) |  | (939 | )
Accounts receivable, net | $ | 701,522 |  |  | $ | 625,258 |
Contract with Customer, Asset and Liability | Net contract assets consisted of the following (dollars in thousands):
| April 27, 2019 |  | January 26, 2019
Contract assets | $ | 297,630 |  |  | $ | 215,849 |
Contract liabilities | 12,815 |  |  | 15,125 |
Contract assets, net | $ | 284,815 |  |  | $ | 200,724 |
Accounts Receivable Risk | Customers whose combined amounts of trade accounts receivable and contract assets, net exceeded 10% of total combined accounts receivable and contract assets, net as of April 27, 2019 or January 26, 2019 were as follows (dollars in millions):
| April 27, 2019 |  | January 26, 2019
| Amount |  | % of Total |  | Amount |  | % of Total
Verizon Communications Inc. | $ | 390.3 |  |  | 39.6% |  | $ | 298.4 |  |  | 36.2%
CenturyLink, Inc. | $ | 152.7 |  |  | 15.5% |  | $ | 147.2 |  |  | 17.9%
Comcast Corporation | $ | 131.1 |  |  | 13.3% |  | $ | 127.2 |  |  | 15.4%
AT&T Inc. | $ | 114.3 |  |  | 11.6% |  | $ | 90.6 |  |  | 11.0%
Total contract revenues by customer type during the three months ended April 27, 2019 and April 28, 2018 were as follows (dollars in millions):
| For the Three Months Ended
| April 27, 2019 |  | April 28, 2018
| Amount |  | % of Total |  | Amount |  | % of Total
Telecommunications | $ | 761.4 |  |  | 91.3% |  | $ | 667.2 |  |  | 91.2%
Underground facility locating | 48.2 |  |  | 5.8 |  | 45.1 |  |  | 6.2
Electrical and gas utilities and other | 24.1 |  |  | 2.9 |  | 19.1 |  |  | 2.6
Total contract revenues | $ | 833.7 |  |  | 100.0% |  | $ | 731.4 |  |  | 100.0%
Customers whose contract revenues exceeded 10% of total contract revenues during the three months ended April 27, 2019 or April 28, 2018, as well as total contract revenues from all other customers combined, were as follows (dollars in millions):
| For the Three Months Ended
| April 27, 2019 |  | April 28, 2018
| Amount |  | % of Total |  | Amount |  | % of Total
AT&T Inc. | $ | 209.3 |  |  | 25.1% |  | $ | 177.0 |  |  | 24.2%
Verizon Communications Inc. | 179.8 |  |  | 21.6 |  | 122.1 |  |  | 16.7
Comcast Corporation | 137.1 |  |  | 16.4 |  | 159.2 |  |  | 21.8
CenturyLink, Inc. | 109.8 |  |  | 13.2 |  | 89.7 |  |  | 12.3
Total other customers combined | 197.7 |  |  | 23.7 |  | 183.4 |  |  | 25.0
Total contract revenues | $ | 833.7 |  |  | 100.0% |  | $ | 731.4 |  |  | 100.0%

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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