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Accounts Receivable | 3 Months Ended
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Apr. 28, 2018
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. See Note 2, Significant Accounting Policies and Estimates, for further information on the Company’s policies related to these balance sheet accounts, as well as its revenue recognition policies. Accounts Receivable Accounts receivable consisted of the following (dollars in thousands):
| April 28, 2018 |  | January 27, 2018
Trade accounts receivable | $ | 309,724 |  |  | $ | 300,271 |
Unbilled accounts receivable | 318,007 |  |  | — |
Retainage | 18,225 |  |  | 19,411 |
Total | 645,956 |  |  | 319,682 |
Less: allowance for doubtful accounts | (976 | ) |  | (998 | )
Accounts receivable, net | $ | 644,980 |  |  | $ | 318,684 |
See Note 3, Accounting Standards, for further information on the comparative unbilled accounts receivable as of April 28, 2018 and January 27, 2018 as a result of the adoption of ASU 2014-09. Trade accounts receivable and unbilled accounts receivable increased $2.1 million and $3.9 million, respectively, from the fiscal 2019 acquisition. During the three months ended April 28, 2018 and April 29, 2017, write-offs to the allowance for doubtful accounts, net of recoveries, were not material. Contract Assets and Contract Liabilities Net contract assets consisted of the following (dollars in thousands):
| April 28, 2018 |  | January 27, 2018
Contract assets | $ | 101,163 |  |  | $ | 369,472 |
Contract liabilities | 5,730 |  |  | 6,480 |
Contract assets, net | $ | 95,433 |  |  | $ | 362,992 |
See Note 3, Accounting Standards, for further information on the comparative contract assets as of April 28, 2018 and January 27, 2018 as a result of the adoption of ASU 2014-09. Excluding the impact of the adoption of ASU 2014-09, the increase in contract assets is primarily a result of a general increase in services performed during the three months ended April 28, 2018 under the related contracts as compared to billing requirements met during the period. There were no other material changes in contract assets during the periods. During the three months ended April 28, 2018, the Company performed services and recognized an immaterial amount of revenue related to its contract liabilities that existed at January 27, 2018. Customer Credit Concentration 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 28, 2018 or January 27, 2018 were as follows (dollars in millions):
| April 28, 2018 |  | January 27, 2018
| Amount |  | % of Total |  | Amount |  | % of Total
Comcast Corporation | $ | 164.2 |  |  | 22.2% |  | $ | 166.5 |  |  | 24.5%
Verizon Communications Inc. | $ | 156.5 |  |  | 21.1% |  | $ | 98.2 |  |  | 14.4%
CenturyLink, Inc. | $ | 120.3 |  |  | 16.3% |  | $ | 126.0 |  |  | 18.5%
AT&T Inc. | $ | 102.8 |  |  | 13.9% |  | $ | 79.2 |  |  | 11.6%
The Company believes that none of its significant customers were experiencing financial difficulties that would materially impact the collectability of the Company’s total accounts receivable and contract assets, net as of April 28, 2018 or January 27, 2018.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5066-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5162-111524 Reference 6: http://www.xbrl.org/2003/role/presentationRef -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 7: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5074-111524 + Details
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