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Accounts Receivable, Contract Assets, and Contract Liabilities (Tables)
 9 Months Ended
Oct. 30, 2021
Receivables [Abstract]  
Accounts Receivable Accounts receivable, net, classified as current, consisted of the following (dollars in thousands):
October 30, 2021January 30, 2021
Trade accounts receivable$363,770 $352,501 
Unbilled accounts receivable576,365 492,324 
Retainage21,145 14,974 
Total961,280 859,799 
Less: allowance for doubtful accounts(1,539)(1,676)
Accounts receivable, net$959,741 $858,123 
The allowance for doubtful accounts changed as follows (dollars in thousands):
For the Three Months EndedFor the Nine Months Ended
October 30, 2021October 24, 2020October 30, 2021October 24, 2020
Cumulative effect from implementation of ASU 2016-13$— $— $— $471 
Allowance for doubtful accounts at beginning of period1,527 1,605 1,676 4,582 
Provision for bad debt17 117 2,918 353 
Amounts charged against the allowance(5)29 (3,055)(3,655)
Allowance for doubtful accounts at end of period$1,539 $1,751 $1,539 $1,751 
Contract Assets and Contract Liabilities Net contract assets consisted of the following (dollars in thousands):
October 30, 2021January 30, 2021
Contract assets$110,685 $197,110 
Contract liabilities 13,943 14,101 
Contract assets, net$96,742 $183,009 
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 30, 2021 or January 30, 2021 were as follows (dollars in millions):

October 30, 2021January 30, 2021
Amount% of TotalAmount% of Total
Verizon Communications Inc.$233.5 22.1%$389.9 37.4%
Lumen Technologies(1)
$177.4 16.8%$173.5 16.6%
Comcast Corporation$131.5 12.4%$131.7 12.6%
AT&T Inc.$107.0 10.1%$71.7 6.9%
Customers whose contract revenues exceeded 10% of total contract revenues during the three and nine months ended October 30, 2021 or October 24, 2020, 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 30, 2021October 24, 2020October 30, 2021October 24, 2020
Amount% of TotalAmount% of TotalAmount% of TotalAmount% of Total
AT&T Inc.$199.5 23.4%$118.9 14.7%$532.6 22.5%$407.5 16.6%
Comcast Corporation121.0 14.2143.6 17.7373.8 15.8393.0 16.0
Lumen Technologies(1)
103.0 12.1134.4 16.6284.2 12.0441.5 18.0
Verizon Communications Inc.93.4 10.9144.817.9275.7 11.6483.819.8
Total other customers combined337.1 39.5268.633.1902.7 38.1722.729.5
Total contract revenues$854.0 100.0%$810.3 100.0%$2,369.0 100.0%$2,448.5 100.0%
Total contract revenues by customer type during the three and nine months ended October 30, 2021 and October 24, 2020 were as follows (dollars in millions):
For the Three Months EndedFor the Nine Months Ended
October 30, 2021October 24, 2020October 30, 2021October 24, 2020
Amount% of TotalAmount% of TotalAmount% of TotalAmount% of Total
Telecommunications$757.9 88.8%$721.2 89.0%$2,095.1 88.4%$2,193.9 89.6%
Underground facility locating67.6 7.959.0 7.3198.2 8.4171.3 7.0
Electrical and gas utilities and other28.5 3.330.1 3.775.7 3.283.3 3.4
Total contract revenues$854.0 100.0%$810.3 100.0%$2,369.0 100.0%$2,448.5 100.0%