Accounts Receivable (Tables)

12 Months Ended

Jan. 30, 2021

Receivables [Abstract]

Schedule of Accounts Receivable

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

	January 30, 2021		January 25, 2020
Trade accounts receivable	$	352,501	$	355,805
Unbilled accounts receivable	492,324		453,353
Retainage	14,974		12,669
Total	859,799		821,827
Less: allowance for doubtful accounts	(1,676)		(4,582)
Accounts receivable, net	$	858,123	$	817,245

The allowance for doubtful accounts changed as follows (dollars in thousands):

	January 30, 2021		January 25, 2020
Allowance for doubtful accounts at beginning of period	$	4,582	$	17,702
Cumulative effect from implementation of ASU 2016-13	471		—
Provision for bad debt (recovery)	406		(6,540)
Amounts charged against the allowance	(3,783)		(6,580)
Allowance for doubtful accounts at end of period	$	1,676	$	4,582

Contract with Customer, Asset and Liability [Table Text Block]

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

	January 30, 2021		January 25, 2020
Contract assets	$	197,110	$	253,005
Contract liabilities	14,101		16,332
Contract assets, net	$	183,009	$	236,673

Customer Credit Concentration

Customers whose combined amounts of accounts receivable and contract assets, net exceeded 10% of total combined accounts receivable and contract assets, net as of January 30, 2021 or January 25, 2020 were as follows (dollars in millions):

	January 30, 2021				January 25, 2020
	Amount		% of Total		Amount		% of Total
Verizon Communications Inc.	$	389.9	37.4	%	$	440.2	41.8	%
Lumen Technologies (1)	$	173.5	16.6	%	$	175.8	16.7	%
Comcast Corporation	$	131.7	12.6	%	$	114.0	10.8	%

(1) Formerly known as CenturyLink, Inc.

Customers whose contract revenues exceeded 10% of total contract revenues during fiscal 2021, fiscal 2020, and fiscal 2019, as well as total contract revenues from all other customers combined, were as follows:

	Fiscal Year Ended
	January 30, 2021				January 25, 2020				January 26, 2019
	Amount		% of Total		Amount		% of Total		Amount		% of Total
Verizon Communications Inc.	$	601.6	18.8	%	$	728.2	21.8	%	$	599.8	19.2	%
Lumen Technologies (1)	542.0		16.9	%	547.8		16.4	%	425.6		13.6	%
Comcast Corporation	533.9		16.7	%	503.2		15.1	%	650.2		20.8	%
AT&T Inc.	533.7		16.7	%	687.9		20.6	%	664.2		21.2	%
Total other customers combined	988.0		30.9	%	872.6		26.1	%	787.9		25.2	%
Total contract revenues	$	3,199.2	100.0%		$	3,339.7	100.0%		$3,127.7		100.0%

(1) Formerly known as CenturyLink, Inc.

Total contract revenues by customer type during fiscal 2021, fiscal 2020, and fiscal 2019, were as follows (dollars in millions):

	Fiscal Year Ended
	January 30, 2021			January 25, 2020			January 26, 2019
	Amount		% of Total	Amount		% of Total	Amount		% of Total
Telecommunications	$	2,851.6	89.1%	$	3,031.9	90.8%	$	2,855.8	91.3%
Underground facility locating	229.6		7.2%	204.5		6.1%	182.7		5.8%
Electrical and gas utilities and other	118.0		3.7%	103.3		3.1%	89.2		2.9%
Total contract revenues	$	3,199.2	100.0%	$	3,339.7	100.0%	$	3,127.7	100.0%