Accounts Receivable (Tables)

3 Months Ended

Apr. 27, 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. During the three months ended April 27, 2019, the Company recognized a $10.3 million recovery of previously reserved accounts receivable and contract assets based on collections from a customer. The allowance for doubtful accounts changed as follows (dollars in thousands):



	For the Three Months Ended
	April 27, 2019			April 28, 2018
Allowance for doubtful accounts at beginning of period	$	17,702		$	998
Provision for bad debt (recovery)	(10,311		)	(24		)
Amounts (charged) recovered against the allowance	(6,019		)	2
Allowance for doubtful accounts at end of period	$	1,372		$	976

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



	April 27, 2019			January 26, 2019
Trade accounts receivable	$	299,572		$	331,903
Unbilled accounts receivable	393,198			283,463
Retainage	10,124			10,831
Total	702,894			626,197
Less: allowance for doubtful accounts	(1,372		)	(939		)
Accounts receivable, net	$	701,522		$	625,258

Contract with Customer, Asset and Liability

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



	April 27, 2019		January 26, 2019
Contract assets	$	297,630	$	215,849
Contract liabilities	12,815		15,125
Contract assets, net	$	284,815	$	200,724

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 April 27, 2019 or January 26, 2019 were as follows (dollars in millions):



	April 27, 2019			January 26, 2019
	Amount		% of Total	Amount		% of Total
Verizon Communications Inc.	$	390.3	39.6%	$	298.4	36.2%
CenturyLink, Inc.	$	152.7	15.5%	$	147.2	17.9%
Comcast Corporation	$	131.1	13.3%	$	127.2	15.4%
AT&T Inc.	$	114.3	11.6%	$	90.6	11.0%

Total contract revenues by customer type during the three months ended April 27, 2019 and April 28, 2018 were as follows (dollars in millions):



	For the Three Months Ended
	April 27, 2019			April 28, 2018
	Amount		% of Total	Amount		% of Total
Telecommunications	$	761.4	91.3%	$	667.2	91.2%
Underground facility locating	48.2		5.8	45.1		6.2
Electrical and gas utilities and other	24.1		2.9	19.1		2.6
Total contract revenues	$	833.7	100.0%	$	731.4	100.0%

Customers whose contract revenues exceeded 10% of total contract revenues during the three months ended April 27, 2019 or April 28, 2018, as well as total contract revenues from all other customers combined, were as follows (dollars in millions):



	For the Three Months Ended
	April 27, 2019			April 28, 2018
	Amount		% of Total	Amount		% of Total
AT&T Inc.	$	209.3	25.1%	$	177.0	24.2%
Verizon Communications Inc.	179.8		21.6	122.1		16.7
Comcast Corporation	137.1		16.4	159.2		21.8
CenturyLink, Inc.	109.8		13.2	89.7		12.3
Total other customers combined	197.7		23.7	183.4		25.0
Total contract revenues	$	833.7	100.0%	$	731.4	100.0%