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Accounts Receivable (Tables)

9 Months Ended

Oct. 26, 2019

Accounts, Notes, Loans and Financing Receivable [Line Items]

The Company maintains an allowance for doubtful accounts for estimated losses on uncollected balances. Approximately $16.8 million of the allowance for doubtful accounts as of January 26, 2019 was classified as non-current. The allowance for doubtful accounts changed as follows (dollars in thousands):



	For the Three Months Ended					For the Nine Months Ended
	October 26, 2019		October 27, 2018			October 26, 2019			October 27, 2018
Allowance for doubtful accounts at beginning of period	$	924	$	948		$	17,702		$	998
Provision for bad debt (recovery)	3,498		(36		)	(7,015		)	(73		)
Amounts recovered (charged) against the allowance	135		34			(6,130		)	21
Allowance for doubtful accounts at end of period	$	4,557	$	946		$	4,557		$	946

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



	October 26, 2019			January 26, 2019
Trade accounts receivable	$	408,188		$	331,903
Unbilled accounts receivable	503,169			283,463
Retainage	12,696			10,831
Total	924,053			626,197
Less: allowance for doubtful accounts	(4,557		)	(939		)
Accounts receivable, net	$	919,496		$	625,258

Contract with Customer, Asset and Liability

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



	October 26, 2019		January 26, 2019
Contract assets	$	343,191	$	215,849
Contract liabilities	19,893		15,125
Contract assets, net	$	323,298	$	200,724

Accounts Receivable Risk

Customers whose combined amounts of accounts receivable and contract assets, net, exceeded 10% of total combined accounts receivable and contract assets, net, as of October 26, 2019 or January 26, 2019 were as follows (dollars in millions):



	October 26, 2019			January 26, 2019
	Amount		% of Total	Amount		% of Total
Verizon Communications Inc.	$	511.3	41.1%	$	298.4	36.2%
CenturyLink, Inc.	$	200.9	16.1%	$	147.2	17.9%
Comcast Corporation	$	160.2	12.9%	$	127.2	15.4%
AT&T Inc.	$	111.3	8.9%	$	90.6	11.0%

Total contract revenues by customer type during the three and nine months ended October 26, 2019 and October 27, 2018 were as follows (dollars in millions):



	For the Three Months Ended						For the Nine Months Ended
	October 26, 2019			October 27, 2018			October 26, 2019			October 27, 2018
	Amount		% of Total	Amount		% of Total	Amount		% of Total	Amount		% of Total
Telecommunications	$	798.1	90.3%	$	773.2	91.1%	$	2,363.9	90.8%	$	2,167.1	91.1%
Underground facility locating	56.0		6.3	48.8		5.8	158.0		6.1	142.9		6.0
Electrical and gas utilities and other	30.0		3.4	26.2		3.1	80.2		3.1	69.1		2.9
Total contract revenues	$	884.1	100.0%	$	848.2	100.0%	$	2,602.1	100.0%	$	2,379.1	100.0%

Customers whose contract revenues exceeded 10% of total contract revenues during the three or nine months ended October 26, 2019 or October 27, 2018, 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 26, 2019			October 27, 2018			October 26, 2019			October 27, 2018
	Amount		% of Total	Amount		% of Total	Amount		% of Total	Amount		% of Total
Verizon Communications Inc.	$	182.1	20.6%	$	174.1	20.5%	$	566.9	21.8%	$	443.5	18.6%
CenturyLink, Inc.	164.1		18.6	118.8		14.0	412.7		15.9	316.0		13.3
AT&T Inc.	162.9		18.4	164.6		19.4	555.4		21.3	506.8		21.3
Comcast Corporation	131.3		14.9	176.3		20.8	401.6		15.4	506.7		21.3
Total other customers combined	243.7		27.5	214.4		25.3	665.5		25.6	606.1		25.5
Total contract revenues	$	884.1	100.0%	$	848.2	100.0%	$	2,602.1	100.0%	$	2,379.1	100.0%