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Accounts Receivable, Contract Assets, and Contract Liabilities (Tables)
 9 Months Ended
Oct. 29, 2022
Receivables [Abstract]  
Accounts Receivable Accounts receivable, net, classified as current, consisted of the following (dollars in thousands):
October 29, 2022January 29, 2022
Trade accounts receivable$467,812 $330,811 
Unbilled accounts receivable751,329 545,493 
Retainage28,138 20,318 
Total1,247,279 896,622 
Less: allowance for doubtful accounts(2,797)(724)
Accounts receivable, net$1,244,482 $895,898 
The allowance for doubtful accounts changed as follows (dollars in thousands):
For the Three Months EndedFor the Nine Months Ended
October 29, 2022October 30, 2021October 29, 2022October 30, 2021
Allowance for doubtful accounts at beginning of period$785 $1,527 $724 $1,676 
Provision for bad debt2,012 17 2,149 2,918 
Amounts charged against the allowance— (5)(76)(3,055)
Allowance for doubtful accounts at end of period$2,797 $1,539 $2,797 $1,539 
Contract Assets and Contract Liabilities Net contract assets consisted of the following (dollars in thousands):
October 29, 2022January 29, 2022
Contract assets$53,319 $24,539 
Contract liabilities 14,419 18,512 
Contract assets, net$38,900 $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 October 29, 2022 or January 29, 2022 were as follows (dollars in millions):

October 29, 2022January 29, 2022
Amount% of TotalAmount% of Total
Lumen Technologies$226.9 17.6%$166.0 18.4%
AT&T Inc.$176.1 13.7%$106.0 11.7%
Verizon Communications Inc.$153.8 12.0%$144.3 16.0%
Comcast Corporation$145.9 11.3%$113.5 12.6%
Customers whose contract revenues exceeded 10% of total contract revenues during the three and nine months ended October 29, 2022 or October 30, 2021, 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 29, 2022October 30, 2021October 29, 2022October 30, 2021
Amount% of TotalAmount% of TotalAmount% of TotalAmount% of Total
AT&T Inc.$258.2 24.8%$199.5 23.4%$751.5 26.0%$532.6 22.5%
Lumen Technologies142.9 13.6103.0 12.1373.3 12.9284.2 12.0
Comcast Corporation108.8 10.4121.0 14.2331.9 11.5373.8 15.8
Verizon Communications Inc.94.9 9.193.410.9256.8 8.9275.711.6
Total other customers combined437.6 42.1337.139.41,177.5 40.7902.738.1
Total contract revenues$1,042.4 100.0%$854.0 100.0%$2,891.0 100.0%$2,369.0 100.0%
Total contract revenues by customer type during the three and nine months ended October 29, 2022 and October 30, 2021 were as follows (dollars in millions):
For the Three Months EndedFor the Nine Months Ended
October 29, 2022October 30, 2021October 29, 2022October 30, 2021
Amount% of TotalAmount% of TotalAmount% of TotalAmount% of Total
Telecommunications$940.7 90.3%$757.9 88.8%$2,590.5 89.6%$2,095.1 88.4%
Underground facility locating72.1 6.967.6 7.9214.5 7.4198.2 8.4
Electrical and gas utilities and other29.6 2.828.5 3.386.0 3.075.7 3.2
Total contract revenues$1,042.4 100.0%$854.0 100.0%$2,891.0 100.0%$2,369.0 100.0%