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

12 Months Ended

Jan. 29, 2022

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


	January 29, 2022		January 30, 2021
Trade accounts receivable	$	330,811	$	352,501
Unbilled accounts receivable	545,493		492,324
Retainage	20,318		14,974
Total	896,622		859,799
Less: allowance for doubtful accounts	(724)		(1,676)
Accounts receivable, net	$	895,898	$	858,123

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


	January 29, 2022		January 30, 2021
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	2,911		406
Amounts charged against the allowance	(3,863)		(3,783)
Allowance for doubtful accounts at end of period	$	724	$	1,676

Contract with Customer, Asset and Liability

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


	January 29, 2022		January 30, 2021
Contract assets	$	24,539	$	197,110
Contract liabilities	18,512		14,101
Contract assets, net	$	6,027	$	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 January 29, 2022 or January 30, 2021 were as follows (dollars in millions):


	January 29, 2022				January 30, 2021
	Amount		% of Total		Amount		% of Total
Lumen Technologies (1)	$	166.0	18.4	%	$	173.5	16.6	%
Verizon Communications Inc.	$	144.3	16.0	%	$	389.9	37.4	%
Comcast Corporation	$	113.5	12.6	%	$	131.7	12.6	%
AT&T Inc.	$	106.0	11.7	%	$	71.7	6.9	%

(1) Formerly known as CenturyLink, Inc.

Customers whose contract revenues exceeded 10% of total contract revenues during fiscal 2022, fiscal 2021, and fiscal 2020, as well as total contract revenues from all other customers combined, were as follows:


	Fiscal Year Ended
	January 29, 2022				January 30, 2021				January 25, 2020
	Amount		% of Total		Amount		% of Total		Amount		% of Total
AT&T Inc.	$	735.2	23.5	%	$	533.7	16.7	%	$	687.9	20.6	%
Comcast Corporation	473.8		15.1	%	533.9		16.7	%	503.2		15.1	%
Lumen Technologies (1)	373.0		11.9	%	542.0		16.9	%	547.8		16.4	%
Verizon Communications Inc.	352.6		11.3	%	601.6		18.8	%	728.2		21.8	%
Total other customers combined	1,195.9		38.2	%	988.0		30.9	%	872.6		26.1	%
Total contract revenues	$	3,130.5	100.0%		$	3,199.2	100.0%		$3,339.7		100.0%

(1) Formerly known as CenturyLink, Inc.

Total contract revenues by customer type during fiscal 2022, fiscal 2021, and fiscal 2020, were as follows (dollars in millions):


	Fiscal Year Ended
	January 29, 2022			January 30, 2021			January 25, 2020
	Amount		% of Total	Amount		% of Total	Amount		% of Total
Telecommunications	$	2,777.6	88.7%	$	2,851.6	89.1%	$	3,031.9	90.8%
Underground facility locating	255.4		8.2%	229.6		7.2%	204.5		6.1%
Electrical and gas utilities and other	97.5		3.1%	118.0		3.7%	103.3		3.1%
Total contract revenues	$	3,130.5	100.0%	$	3,199.2	100.0%	$	3,339.7	100.0%