Accounts Receivable (Tables)

9 Months Ended

Oct. 27, 2018

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



	October 27, 2018			January 27, 2018
Trade accounts receivable	$	464,332		$	300,271
Unbilled accounts receivable	372,351			—
Retainage	14,032			19,411
Total	850,715			319,682
Less: allowance for doubtful accounts	(946		)	(998		)
Accounts receivable, net	$	849,769		$	318,684

Contract with Customer, Asset and Liability

Contract Assets and Contract Liabilities

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



	October 27, 2018		January 27, 2018
Contract assets	$	147,320	$	369,472
Contract liabilities	7,631		6,480
Contract assets, net	$	139,689	$	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 October 27, 2018 or January 27, 2018 were as follows (dollars in millions):



	October 27, 2018			January 27, 2018
	Amount		% of Total	Amount		% of Total
Verizon Communications Inc.	$	338.7	34.3%	$	98.2	14.4%
Comcast Corporation	$	166.6	16.9%	$	166.5	24.5%
CenturyLink, Inc.	$	142.8	14.5%	$	126.0	18.5%
AT&T Inc.	$	102.7	10.4%	$	79.2	11.6%

Total contract revenues by customer type during the three and nine months ended October 27, 2018 and October 28, 2017 were as follows (dollars in millions):



	For the Three Months Ended						For the Nine Months Ended
	October 27, 2018			October 28, 2017			October 27, 2018			October 28, 2017
	Amount		% of Total	Amount		% of Total	Amount		% of Total	Amount		% of Total
Telecommunications	$	773.2	91.1%	$	687.3	90.9%	$	2,167.1	91.1%	$	2,124.7	91.5%
Underground facility locating	48.8		5.8	48.4		6.4	142.9		6.0	138.0		5.9
Electrical and gas utilities and other	26.2		3.1	20.5		2.7	69.1		2.9	60.0		2.6
Total contract revenues	$	848.2	100.0%	$	756.2	100.0%	$	2,379.1	100.0%	$	2,322.7	100.0%

Customers whose contract revenues exceeded 10% of total contract revenues during the three or nine months ended October 27, 2018 or October 28, 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 Nine Months Ended
	October 27, 2018			October 28, 2017			October 27, 2018				October 28, 2017
	Amount		% of Total	Amount		% of Total	Amount		% of Total		Amount		% of Total
Comcast Corporation	$	176.3	20.8%	$	165.0	21.8%	$	506.7	21.3	%	$	471.0	20.3	%
Verizon Communications Inc.	174.1		20.5	80.6		10.7	443.5		18.6		225.7		9.7
AT&T Inc.	164.6		19.4	143.5		19.0	506.8		21.3		520.1		22.4
CenturyLink, Inc.⁽¹⁾	118.8		14.0	146.1		19.3	316.0		13.3		457.6		19.7
Total other customers combined	214.4		25.3	221.0		29.2	606.1		25.5		648.3		27.9
Total contract revenues	$	848.2	100.0%	$	756.2	100.0%	$	2,379.1	100.0	%	$	2,322.7	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.