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Accounts Receivable | 6 Months Ended
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Jul. 27, 2019
Receivables [Abstract] |
Accounts Receivable | Accounts Receivable, Contract Assets, and Contract Liabilities The following provides further details on the balance sheet accounts of accounts receivable, net; contract assets; and contract liabilities. Accounts Receivable Accounts receivable, net classified as current consisted of the following (dollars in thousands):
| July 27, 2019 |  | January 26, 2019
Trade accounts receivable | $ | 310,934 |  |  | $ | 331,903 |
Unbilled accounts receivable | 476,682 |  |  | 283,463 |
Retainage | 10,216 |  |  | 10,831 |
Total | 797,832 |  |  | 626,197 |
Less: allowance for doubtful accounts | (924 | ) |  | (939 | )
Accounts receivable, net | $ | 796,908 |  |  | $ | 625,258 |
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 Six Months Ended
| July 27, 2019 |  | July 28, 2018 |  | July 27, 2019 |  | July 28, 2018
Allowance for doubtful accounts at beginning of period | $ | 1,372 |  |  | $ | 976 |  |  | $ | 17,702 |  |  | $ | 998 |
Provision for bad debt (recovery) | (202 | ) |  | (14 | ) |  | (10,514 | ) |  | (38 | )
Amounts (charged) recovered against the allowance | (246 | ) |  | (14 | ) |  | (6,264 | ) |  | (12 | )
Allowance for doubtful accounts at end of period | $ | 924 |  |  | $ | 948 |  |  | $ | 924 |  |  | $ | 948 |
Contract Assets and Contract Liabilities Net contract assets consisted of the following (dollars in thousands):
| July 27, 2019 |  | January 26, 2019
Contract assets | $ | 357,615 |  |  | $ | 215,849 |
Contract liabilities | 13,272 |  |  | 15,125 |
Contract assets, net | $ | 344,343 |  |  | $ | 200,724 |
Net contract assets were $344.3 million and $200.7 million as of July 27, 2019 and January 26, 2019, respectively. The increase primarily resulted from services performed under contracts consisting of multiple tasks which will be billed as the tasks are completed. During the three and six months ended July 27, 2019, the Company performed services and recognized $2.6 million and $10.6 million, respectively, of contract revenues related to its contract liabilities that existed at January 26, 2019. See Note 6, Other Current Assets and Other Assets, for information on the Company’s long-term contract assets. Customer Credit Concentration Customers whose combined amounts of accounts receivable and contract assets, net exceeded 10% of total combined accounts receivable and contract assets, net as of July 27, 2019 or January 26, 2019 were as follows (dollars in millions):
| July 27, 2019 |  | January 26, 2019
| Amount |  | % of Total |  | Amount |  | % of Total
Verizon Communications Inc. | $ | 481.8 |  |  | 42.3% |  | $ | 298.4 |  |  | 36.2%
CenturyLink, Inc. | $ | 171.4 |  |  | 15.0% |  | $ | 147.2 |  |  | 17.9%
Comcast Corporation | $ | 142.9 |  |  | 12.5% |  | $ | 127.2 |  |  | 15.4%
AT&T Inc. | $ | 112.3 |  |  | 9.8% |  | $ | 90.6 |  |  | 11.0%
The Company believes that none of the customers above were experiencing financial difficulties that would materially impact the collectability of the Company’s total accounts receivable and contract assets, net as of July 27, 2019 or January 26, 2019.

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 2: 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(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5162-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5066-111524 Reference 6: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(6)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 + Details
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