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Accounts Receivable (Tables) | 12 Months Ended
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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.

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