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Accounts Receivable, Contract Assets, and Contract Liabilities (Tables)
 9 Months Ended
Oct. 28, 2023
Receivables [Abstract]  
Accounts Receivable Accounts receivable, net, classified as current, consisted of the following (dollars in thousands):
October 28, 2023January 28, 2023
Trade accounts receivable$583,621 $367,842 
Unbilled accounts receivable838,471 670,066 
Retainage42,643 32,351 
Total1,464,735 1,070,259 
Less: allowance for doubtful accounts(3,565)(3,246)
Accounts receivable, net$1,461,170 $1,067,013 
The allowance for doubtful accounts changed as follows (dollars in thousands):
For the Three Months EndedFor the Nine Months Ended
October 28, 2023October 29, 2022October 28, 2023October 29, 2022
Allowance for doubtful accounts at beginning of period$3,801 $785 $3,246 $724 
Provision for bad debt (recovery)(205)2,012 1,028 2,149 
Amounts charged against the allowance(31)— (709)(76)
Allowance for doubtful accounts at end of period$3,565 $2,797 $3,565 $2,797 
Contract Assets and Contract Liabilities Net contract assets consisted of the following (dollars in thousands):
October 28, 2023January 28, 2023
Contract assets$70,451 $43,932 
Contract liabilities 21,320 19,512 
Contract assets, net$49,131 $24,420 
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 October 28, 2023 or January 28, 2023 were as follows (dollars in millions):

October 28, 2023January 28, 2023
Amount% of TotalAmount% of Total
Lumen Technologies$381.2 25.2%$189.3 17.4%
Comcast Corporation$124.4 8.2%$125.2 11.5%
AT&T Inc.$102.6 6.8%$136.2 12.5%
Frontier Communications Corporation$100.8 6.7%$153.2 14.0%
Customers whose contract revenues exceeded 10% of total contract revenues during the three and nine months ended October 28, 2023 or October 29, 2022, as well as total contract revenues from all other customers combined, were as follows (dollars in millions):
For the Three Months EndedFor the Nine Months Ended
October 28, 2023October 29, 2022October 28, 2023October 29, 2022
Amount% of TotalAmount% of TotalAmount% of TotalAmount% of Total
AT&T Inc.$145.1 12.8%$258.2 24.8%$543.8 16.9%$751.5 26.0%
Lumen Technologies187.6 16.5142.9 13.6486.5 15.1373.3 12.9
Comcast Corporation111.2 9.8108.8 10.4351.3 10.9331.9 11.5
Total other customers combined692.2 60.9532.551.21,841.5 57.11,434.3 49.6
Total contract revenues$1,136.1 100.0%$1,042.4 100.0%$3,223.1 100.0%$2,891.0 100.0%
Total contract revenues by customer type during the three and nine months ended October 28, 2023 and October 29, 2022 were as follows (dollars in millions):
For the Three Months EndedFor the Nine Months Ended
October 28, 2023October 29, 2022October 28, 2023October 29, 2022
Amount% of TotalAmount% of TotalAmount% of TotalAmount% of Total
Telecommunications$1,023.2 90.1%$940.7 90.3%$2,888.5 89.6%$2,590.5 89.6%
Underground facility locating76.9 6.772.1 6.9226.6 7.0214.5 7.4
Electrical and gas utilities and other36.0 3.229.6 2.8108.0 3.486.0 3.0
Total contract revenues$1,136.1 100.0%$1,042.4 100.0%$3,223.1 100.0%$2,891.0 100.0%