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Accounts Receivable, Contract Assets, and Contract Liabilities
 6 Months Ended
Jul. 25, 2020
Receivables [Abstract]  
Accounts Receivable, Contract Assets, and Contract Liabilities 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 25, 2020January 25, 2020
Trade accounts receivable$378,461 $355,805 
Unbilled accounts receivable508,123 453,353 
Retainage12,854 12,669 
Total899,438 821,827 
Less: allowance for doubtful accounts(1,605)(4,582)
Accounts receivable, net$897,833 $817,245 
 
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):
For the Three Months EndedFor the Six Months Ended
July 25, 2020July 27, 2019July 25, 2020July 27, 2019
Allowance for doubtful accounts at beginning of period$5,166 $1,372 $4,582 $17,702 
Cumulative effect from implementation of ASU 2016-13— — 471 — 
Provision for bad debt (recovery)119 (202)236 (10,514)
Amounts recovered (charged) against the allowance(3,680)(246)(3,684)(6,264)
Allowance for doubtful accounts at end of period$1,605 $924 $1,605 $924 

Contract Assets and Contract Liabilities

Net contract assets consisted of the following (dollars in thousands):
July 25, 2020January 25, 2020
Contract assets$257,893 $253,005 
Contract liabilities 18,829 16,332 
Contract assets, net$239,064 $236,673 

Net contract assets were $239.1 million and $236.7 million as of July 25, 2020 and January 25, 2020, 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 25, 2020, we performed services and recognized $3.3 million and $11.8 million, respectively, of contract revenues related to its contract liabilities that existed at January 25, 2020. See Note 6, 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 July 25, 2020 or January 25, 2020 were as follows (dollars in millions):
July 25, 2020January 25, 2020
Amount% of TotalAmount% of Total
Verizon Communications Inc.$462.3 40.7%$440.2 41.8%
CenturyLink, Inc.$204.1 18.0%$175.8 16.7%
Comcast Corporation$142.7 12.6%$114.0 10.8%

We believe 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 25, 2020 or January 25, 2020. On April 14, 2020, Frontier Communications filed a voluntary petition under Chapter 11 of the United States Bankruptcy Code in the U.S. Bankruptcy Court for the Southern District of New York, to implement a prearranged debt restructuring plan. As of July 25, 2020, the Company had outstanding receivables and contract assets in aggregate of approximately $23.1 million with Frontier Communications. The Company has been identified as a critical vendor and expects to continue to provide service to Frontier Communications pursuant to existing contractual obligations and be paid in full for pre-petition and post-petition receivables and contract assets.