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Accounts Receivable, Contract Assets, and Contract Liabilities (Tables)
 6 Months Ended
Jul. 30, 2022
Receivables [Abstract]  
Accounts Receivable Accounts receivable, net, classified as current, consisted of the following (dollars in thousands):
July 30, 2022January 29, 2022
Trade accounts receivable$412,859 $330,811 
Unbilled accounts receivable682,119 545,493 
Retainage24,402 20,318 
Total1,119,380 896,622 
Less: allowance for doubtful accounts(785)(724)
Accounts receivable, net$1,118,595 $895,898 
The allowance for doubtful accounts changed as follows (dollars in thousands):
For the Three Months EndedFor the Six Months Ended
July 30, 2022July 31, 2021July 30, 2022July 31, 2021
Allowance for doubtful accounts at beginning of period$761 $4,237 $724 $1,676 
Provision for bad debt102 78 134 2,901 
Amounts charged against the allowance(78)(2,788)(73)(3,050)
Allowance for doubtful accounts at end of period$785 $1,527 $785 $1,527 
Contract Assets and Contract Liabilities Net contract assets consisted of the following (dollars in thousands):
July 30, 2022January 29, 2022
Contract assets$45,715 $24,539 
Contract liabilities 16,170 18,512 
Contract assets, net$29,545 $6,027 
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 30, 2022 or January 29, 2022 were as follows (dollars in millions):

July 30, 2022January 29, 2022
Amount% of TotalAmount% of Total
Lumen Technologies$231.1 20.1%$166.0 18.4%
AT&T Inc.$162.3 14.1%$106.0 11.7%
Verizon Communications Inc.$147.7 12.9%$144.3 16.0%
Comcast Corporation$133.9 11.7%$113.5 12.6%
Customers whose contract revenues exceeded 10% of total contract revenues during the three and six months ended July 30, 2022 or July 31, 2021, as well as total contract revenues from all other customers combined, were as follows (dollars in millions):
For the Three Months EndedFor the Six Months Ended
July 30, 2022July 31, 2021July 30, 2022July 31, 2021
Amount% of TotalAmount% of TotalAmount% of TotalAmount% of Total
AT&T Inc.$255.9 26.3%$177.5 22.5%$493.3 26.7%$333.1 22.0%
Lumen Technologies127.6 13.195.4 12.1230.4 12.5181.2 12.0
Comcast Corporation111.8 11.5121.7 15.5223.0 12.1252.8 16.7
Verizon Communications Inc.80.8 8.390.811.5161.8 8.8182.312.0
Total other customers combined396.2 40.8302.238.4740.1 40.0565.737.3
Total contract revenues$972.3 100.0%$787.6 100.0%$1,848.6 100.0%$1,515.1 100.0%
Total contract revenues by customer type during the three and six months ended July 30, 2022 and July 31, 2021 were as follows (dollars in millions):
For the Three Months EndedFor the Six Months Ended
July 30, 2022July 31, 2021July 30, 2022July 31, 2021
Amount% of TotalAmount% of TotalAmount% of TotalAmount% of Total
Telecommunications$871.0 89.6%$697.5 88.6%$1,649.9 89.3%$1,337.2 88.3%
Underground facility locating71.4 7.365.8 8.3142.3 7.7130.7 8.6
Electrical and gas utilities and other29.9 3.124.3 3.156.4 3.047.2 3.1
Total contract revenues$972.3 100.0%$787.6 100.0%$1,848.6 100.0%$1,515.1 100.0%