Accounts Receivable (Tables)

3 Months Ended

Apr. 25, 2020

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

Schedule of Accounts Receivable

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

	April 25, 2020		January 25, 2020
Trade accounts receivable	$	384,383	$	355,805
Unbilled accounts receivable	479,706		453,353
Retainage	11,868		12,669
Total	875,957		821,827
Less: allowance for doubtful accounts	(5,166)		(4,582)
Accounts receivable, net	$	870,791	$	817,245

maintain 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
	April 25, 2020		April 27, 2019
Cumulative effect from implementation of ASU 2016-13	$	471	$	—
Allowance for doubtful accounts at beginning of period	4,582		17,702
Provision for bad debt (recovery)	118		(10,311)
Amounts recovered (charged) against the allowance	(5)		(6,019)
Allowance for doubtful accounts at end of period	$	5,166	$	1,372

Contract with Customer, Asset and Liability

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

	April 25, 2020		January 25, 2020
Contract assets	$	275,001	$	253,005
Contract liabilities	24,566		16,332
Contract assets, net	$	250,435	$	236,673

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

	April 25, 2020			January 25, 2020
	Amount		% of Total	Amount		% of Total
Verizon Communications Inc.	$	471.2	41.9%	$	440.2	41.8%
CenturyLink, Inc.	$	204.6	18.2%	$	175.8	16.7%
Comcast Corporation	$	130.0	11.6%	$	114.0	10.8%

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

	For the Three Months Ended
	April 25, 2020			April 27, 2019
	Amount		% of Total	Amount		% of Total
Verizon Communications Inc.	$	176.1	21.6%	$	179.8	21.6%
AT&T Inc.	154.0		18.9	209.3		25.1
CenturyLink, Inc.	148.8		18.3	109.8		13.2
Comcast Corporation	118.0		14.5	137.1		16.4
Total other customers combined	217.4		26.7	197.7		23.7
Total contract revenues	$	814.3	100.0%	$	833.7	100.0%

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

	For the Three Months Ended
	April 25, 2020			April 27, 2019
	Amount		% of Total	Amount		% of Total
Telecommunications	$	726.0	89.2%	$	761.4	91.3%
Underground facility locating	53.3		6.5	48.2		5.8
Electrical and gas utilities and other	35.0		4.3	24.1		2.9
Total contract revenues	$	814.3	100.0%	$	833.7	100.0%