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

6 Months Ended

Jul. 25, 2020

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


	July 25, 2020		January 25, 2020
Trade accounts receivable	$	378,461	$	355,805
Unbilled accounts receivable	508,123		453,353
Retainage	12,854		12,669
Total	899,438		821,827
Less: allowance for doubtful accounts	(1,605)		(4,582)
Accounts receivable, net	$	897,833	$	817,245

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


	For the Three Months Ended						For the Six Months Ended
	July 25, 2020		July 27, 2019		July 25, 2020		July 27, 2019
Allowance for doubtful accounts at beginning of period	$	5,166	$	1,372	$	4,582	$	17,702
Cumulative effect from implementation of ASU 2016-13	—		—		471		—
Provision for bad debt (recovery)	119		(202)		236		(10,514)
Amounts recovered (charged) against the allowance	(3,680)		(246)		(3,684)		(6,264)
Allowance for doubtful accounts at end of period	$	1,605	$	924	$	1,605	$	924

Contract Assets and Contract Liabilities

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


	July 25, 2020		January 25, 2020
Contract assets	$	257,893	$	253,005
Contract liabilities	18,829		16,332
Contract assets, net	$	239,064	$	236,673

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 July 25, 2020 or January 25, 2020 were as follows (dollars in millions):


	July 25, 2020					January 25, 2020
	Amount		% of Total	Amount		% of Total
Verizon Communications Inc.	$	462.3	40.7%	$	440.2	41.8%
CenturyLink, Inc.	$	204.1	18.0%	$	175.8	16.7%
Comcast Corporation	$	142.7	12.6%	$	114.0	10.8%

Customers whose contract revenues exceeded 10% of total contract revenues during the three and six months ended July 25, 2020 or July 27, 2019, as well as total contract revenues from all other customers combined, were as follows (dollars in millions):


	For the Three Months Ended											For the Six Months Ended
	July 25, 2020					July 27, 2019				July 25, 2020			July 27, 2019
	Amount		% of Total	Amount		% of Total	Amount		% of Total	Amount		% of Total
Verizon Communications Inc.	$	163.0	19.8%	$	205.0	23.2%	$	339.1	20.7%	$	384.8	22.4%
CenturyLink, Inc.	158.4		19.2	138.7		15.7	307.1		18.7	248.5		14.5
AT&T Inc.	134.6		16.3	183.3		20.7	288.6		17.6	392.5		22.8
Comcast Corporation	131.4		15.9	133.2		15.1	249.3		15.2	270.3		15.7
Total other customers combined	236.5		28.7	224.0		25.3	454.1		27.7	421.9		24.6
Total contract revenues	$	823.9	100.0%	$	884.2	100.0%	$	1,638.2	100.0%	$	1,718.0	100.0%

Total contract revenues by customer type during the three and six months ended July 25, 2020 and July 27, 2019 were as follows (dollars in millions):


	For the Three Months Ended											For the Six Months Ended
	July 25, 2020					July 27, 2019				July 25, 2020			July 27, 2019
	Amount		% of Total	Amount		% of Total	Amount		% of Total	Amount		% of Total
Telecommunications	$	746.7	90.6%	$	804.4	91.0%	$	1,472.7	89.9%	$	1,565.8	91.1%
Underground facility locating	58.9		7.2	53.8		6.1	112.3		6.9	102		5.9
Electrical and gas utilities and other	18.3		2.2	26.0		2.9	53.2		3.2	50.2		3.0
Total contract revenues	$	823.9	100.0%	$	884.2	100.0%	$	1,638.2	100.0%	$	1,718.0	100.0%