Accounts Receivable (Tables)

6 Months Ended

Jul. 28, 2018

Accounts receivable consisted of the following (dollars in thousands):



	July 28, 2018			January 27, 2018
Trade accounts receivable	$	326,269		$	300,271
Unbilled accounts receivable	341,971			—
Retainage	17,570			19,411
Total	685,810			319,682
Less: allowance for doubtful accounts	(948		)	(998		)
Accounts receivable, net	$	684,862		$	318,684

Contract with Customer, Asset and Liability

Contract Assets and Contract Liabilities

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



	July 28, 2018		January 27, 2018
Contract assets	$	169,931	$	369,472
Contract liabilities	8,152		6,480
Contract assets, net	$	161,779	$	362,992

Accounts Receivable Risk

Customers whose combined amounts of trade accounts receivable and contract assets, net exceeded 10% of total combined accounts receivable and contract assets, net as of July 28, 2018 or January 27, 2018 were as follows (dollars in millions):



	July 28, 2018			January 27, 2018
	Amount		% of Total	Amount		% of Total
Verizon Communications Inc.	$	241.3	28.5%	$	98.2	14.4%
Comcast Corporation	$	160.8	19.0%	$	166.5	24.5%
CenturyLink, Inc.	$	126.5	15.0%	$	126.0	18.5%
AT&T Inc.	$	98.1	11.6%	$	79.2	11.6%

Total contract revenues by customer type during the three and six months ended July 28, 2018 and July 29, 2017 were as follows (dollars in millions):



	For the Three Months Ended						For the Six Months Ended
	July 28, 2018			July 29, 2017			July 28, 2018			July 29, 2017
	Amount		% of Total	Amount		% of Total	Amount		% of Total	Amount		% of Total
Telecommunications	$	726.7	90.9%	$	712.0	91.3%	$	1,393.9	91.1%	$	1,437.4	91.8%
Underground facility locating	49.0		6.1	47.5		6.1	94.1		6.1	89.6		5.7
Electrical and gas utilities and other	23.8		3.0	20.7		2.6	42.8		2.8	39.5		2.5
Total contract revenues	$	799.5	100.0%	$	780.2	100.0%	$	1,530.8	100.0%	$	1,566.5	100.0%

Customers whose contract revenues exceeded 10% of total contract revenues during the three or six months ended July 28, 2018 or July 29, 2017, 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 28, 2018			July 29, 2017			July 28, 2018				July 29, 2017
	Amount		% of Total	Amount		% of Total	Amount		% of Total		Amount		% of Total
Comcast Corporation	$	171.2	21.4%	$	153.1	19.6%	$	330.3	21.6	%	$	306.0	19.5	%
AT&T Inc.	165.2		20.7	163.5		21.0	342.2		22.4		376.6		24.0
Verizon Communications Inc.	147.3		18.4	78.3		10.0	269.5		17.6		145.1		9.3
CenturyLink, Inc.⁽¹⁾	107.6		13.5	165.2		21.2	197.2		12.9		311.5		19.9
Total other customers combined	208.2		26.0	220.1		28.2	391.6		25.5		427.3		27.3
Total contract revenues	$	799.5	100.0%	$	780.2	100.0%	$	1,530.8	100.0	%	$	1,566.5	100.0	%

⁽¹⁾For comparison purposes in the table above, amounts from CenturyLink, Inc. and Level 3 Communications, Inc. have been combined for periods prior to their November 2017 merger.