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Accounts Receivable (Tables)
 12 Months Ended
Jan. 25, 2020
Receivables [Abstract]  
Schedule of Accounts Receivable
Accounts receivable, net classified as current, consisted of the following (dollars in thousands):
 
January 25, 2020
 
January 26, 2019
Trade accounts receivable
$
355,805

 
$
331,903

Unbilled accounts receivable
453,353

 
283,463

Retainage
12,669

 
10,831

Total
821,827

 
626,197

Less: allowance for doubtful accounts
(4,582
)
 
(939
)
Accounts receivable, net
$
817,245

 
$
625,258


The allowance for doubtful accounts changed as follows (dollars in thousands):
 
January 25, 2020
 
January 26, 2019
Allowance for doubtful accounts at beginning of period
$
17,702

 
$
998

Provision for bad debt (recovery)
(6,540
)
 
16,677

Amounts recovered (charged) against the allowance
(6,580
)
 
27

Allowance for doubtful accounts at end of period
$
4,582

 
$
17,702
Contract with Customer, Asset and Liability [Table Text Block]
Net contract assets consisted of the following (dollars in thousands):
 
January 25, 2020
 
January 26, 2019
Contract assets
$
253,005

 
$
215,849

Contract liabilities
16,332

 
15,125

Contract assets, net
$
236,673

 
$
200,724
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
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 25, 2020 or January 26, 2019 were as follows (dollars in millions):
 
January 25, 2020
 
January 26, 2019
 
Amount
 
% of Total
 
Amount
 
% of Total
Verizon Communications Inc.
$
440.2

 
41.8%
 
$
298.4

 
36.2%
CenturyLink, Inc.
$
175.8

 
16.7%
 
$
147.2

 
17.9%
Comcast Corporation
$
114.0

 
10.8%
 
$
127.2

 
15.4%
AT&T Inc.
$
97.2

 
9.2%
 
$
90.6

 
11.0%

Total contract revenues by customer type during fiscal 2020, fiscal 2019, the 2018 transition period, and fiscal 2017 were as follows (dollars in millions):
 
Fiscal Year Ended
 
Six Months Ended
 
Fiscal Year Ended
 
January 25, 2020
 
January 26, 2019
 
January 27, 2018
 
July 29, 2017
 
Amount
% of Total
 
Amount
% of Total
 
Amount
% of Total
 
Amount
% of Total
Telecommunications
$
3,031.9

90.8%
 
$
2,855.8

91.3%
 
$
1,284.1

91.0%
 
$
2,819.9

91.9%
Underground facility locating
204.5

6.1%
 
182.7

5.8%
 
88.6

6.3%
 
167.9

5.5%
Electrical and gas utilities and other
103.3

3.1%
 
89.2

2.9%
 
38.6

2.7%
 
79.1

2.6%
Total contract revenues
$
3,339.7

100.0%
 
$
3,127.7

100.0%
 
$
1,411.3

100.0%
 
$
3,066.9

100.0%

Customers whose contract revenues exceeded 10% of total contract revenues during fiscal 2020, fiscal 2019, the 2018 transition period, or fiscal 2017, as well as total contract revenues from all other customers combined, were as follows:
 
Fiscal Year Ended
 
Six Months Ended
 
Fiscal Year Ended
 
January 25, 2020
 
January 26, 2019
 
January 27, 2018
 
July 29, 2017
 
Amount
% of Total
 
Amount
% of Total
 
Amount
% of Total
 
Amount
% of Total
Verizon Communications Inc.(1)
$728.2
21.8%
 
$599.8
19.2%
 
$168.7
12.0%
 
$282.7
9.2%
AT&T Inc.
687.9
20.6%
 
664.2
21.2%
 
290.1
20.6%
 
806.7
26.3%
Century Link, Inc.(2)
547.8
16.4%
 
425.6
13.6%
 
247.0
17.5%
 
556.8
18.2%
Comcast Corporation
503.2
15.1%
 
650.2
20.8%
 
304.4
21.6%
 
543.6
17.7%
Total other customers combined
872.6
26.1%
 
787.9
25.2%
 
401.1
28.3%
 
877.1
28.6%
Total contract revenues
$
3,339.7

100.0%
 
$
3,127.7

100.0%
 
$1,411.3
100.0%
 
$3,066.9
100.0%


(1) For comparison purposes in the table above, amounts from Verizon Communications Inc. and XO Communications LLC’s fiber-optic network business have been combined for periods prior to their February 2017 merger.

(2) 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.