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Accounts Receivable, Contract Assets, and Contract Liabilities (Tables)

3 Months Ended

May 01, 2021

Accounts receivable, net, classified as current, consisted of the following (dollars in thousands):


	May 1, 2021		January 30, 2021
Trade accounts receivable	$	326,582	$	352,501
Unbilled accounts receivable	529,150		492,324
Retainage	16,050		14,974
Total	871,782		859,799
Less: allowance for doubtful accounts	(4,237)		(1,676)
Accounts receivable, net	$	867,545	$	858,123

The allowance for doubtful accounts changed as follows (dollars in thousands):


	For the Three Months Ended
	May 1, 2021		April 25, 2020
Cumulative effect from implementation of ASU 2016-13	$	—	$	471
Allowance for doubtful accounts at beginning of period	1,676		4,582
Provision for bad debt	2,823		118
Amounts charged against the allowance	(262)		(5)
Allowance for doubtful accounts at end of period	$	4,237	$	5,166

Contract Assets and Contract Liabilities

Net contract assets consisted of the following (dollars in thousands):


	May 1, 2021		January 30, 2021
Contract assets	$	177,212	$	197,110
Contract liabilities	18,833		14,101
Contract assets, net	$	158,379	$	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 May 1, 2021 or January 30, 2021 were as follows (dollars in millions):


	May 1, 2021			January 30, 2021
	Amount		% of Total	Amount		% of Total
Verizon Communications Inc.	$	361.5	35.1%	$	389.9	37.4%
Lumen Technologies(1)	$	153.5	14.9%	$	173.5	16.6%
Comcast Corporation	$	134.8	13.1%	$	131.7	12.6%

Customers whose contract revenues exceeded 10% of total contract revenues during the three months ended May 1, 2021 or April 25, 2020, as well as total contract revenues from all other customers combined, were as follows (dollars in millions):


	For the Three Months Ended
	May 1, 2021			April 25, 2020
	Amount		% of Total	Amount		% of Total
AT&T Inc.	$	155.6	21.4%	$	154.0	18.9%
Comcast Corporation	131.1		18.0	118.0		14.5
Verizon Communications Inc.	91.5		12.6	176.1		21.6
Lumen Technologies(1)	85.8		11.8	148.8		18.3
Total other customers combined	263.5		36.2	217.4		26.7
Total contract revenues	$	727.5	100.0%	$	814.3	100.0%

Total contract revenues by customer type during the three months ended May 1, 2021 and April 25, 2020 were as follows (dollars in millions):


	For the Three Months Ended
	May 1, 2021			April 25, 2020
	Amount		% of Total	Amount		% of Total
Telecommunications	$	639.7	87.9%	$	726.0	89.2%
Underground facility locating	65.0		8.9	53.3		6.5
Electrical and gas utilities and other	22.8		3.2	35.0		4.3
Total contract revenues	$	727.5	100.0%	$	814.3	100.0%