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Accounts Receivable | 12 Months Ended
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Jan. 25, 2020
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 our policies related to these balance sheet accounts, as well as our revenue recognition policies. Accounts Receivable Accounts receivable, net classified as current, consisted of the following (dollars in thousands):
| January 25, 2020 |  | January 26, 2019
Trade accounts receivable | $ | 355,805 |  |  | $ | 331,903 |
Unbilled accounts receivable | 453,353 |  |  | 283,463 |
Retainage | 12,669 |  |  | 10,831 |
Total | 821,827 |  |  | 626,197 |
Less: allowance for doubtful accounts | (4,582 | ) |  | (939 | )
Accounts receivable, net | $ | 817,245 |  |  | $ | 625,258 |
As of January 26, 2019, accounts receivable of $24.8 million from Windstream was classified as non-current in other assets and is net of the related allowance for doubtful accounts. As of January 25, 2020, all of Windstream’s accounts receivable was classified as current. See Note 7, Other Current Assets and Other Assets, for further information on our non-current accounts receivable, net. We maintain 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):
| January 25, 2020 |  | January 26, 2019
Allowance for doubtful accounts at beginning of period | $ | 17,702 |  |  | $ | 998 |
Provision for bad debt (recovery) | (6,540 | ) |  | 16,677 |
Amounts recovered (charged) against the allowance | (6,580 | ) |  | 27 |
Allowance for doubtful accounts at end of period | $ | 4,582 |  |  | $ | 17,702 |
Contract Assets and Contract Liabilities Net contract assets consisted of the following (dollars in thousands):
| January 25, 2020 |  | January 26, 2019
Contract assets | $ | 253,005 |  |  | $ | 215,849 |
Contract liabilities | 16,332 |  |  | 15,125 |
Contract assets, net | $ | 236,673 |  |  | $ | 200,724 |
The increase in contract assets, net, in fiscal 2020 from fiscal 2019 primarily resulted from services performed under contracts consisting of multiple tasks which will be billed as the tasks are completed. There were no other significant changes in contract assets during the period. During fiscal 2020, we performed services and recognized revenue related to all but an immaterial amount of our contract liabilities that existed at January 26, 2019. See Note 7, Other Current Assets and Other Assets, for information on our 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 January 25, 2020 or January 26, 2019 were as follows (dollars in millions):
| January 25, 2020 |  | January 26, 2019
| Amount |  | % of Total |  | Amount |  | % of Total
Verizon Communications Inc. | $ | 440.2 |  |  | 41.8% |  | $ | 298.4 |  |  | 36.2%
CenturyLink, Inc. | $ | 175.8 |  |  | 16.7% |  | $ | 147.2 |  |  | 17.9%
Comcast Corporation | $ | 114.0 |  |  | 10.8% |  | $ | 127.2 |  |  | 15.4%
AT&T Inc. | $ | 97.2 |  |  | 9.2% |  | $ | 90.6 |  |  | 11.0%
We believe that none of the customers above were experiencing financial difficulties that would materially impact the collectability of our total accounts receivable and contract assets, net, as of January 25, 2020 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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