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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Jan. 27, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The Company’s goodwill balance was $321.7 million, $321.7 million, and $310.2 million as of January 27, 2018, July 29, 2017, and July 30, 2016, respectively. Changes in the carrying amount of goodwill were as follows (dollars in thousands):
| Goodwill |  | Accumulated Impairment Losses |  | Total
Balance as of July 25, 2015 | $ | 467,420 |  |  | $ | (195,767 | ) |  | $ | 271,653 |
Purchase price allocation adjustments | 101 |  |  | — |  |  | 101 |
Goodwill from fiscal 2016 acquisitions | 38,403 |  |  | — |  |  | 38,403 |
Balance as of July 30, 2016 | 505,924 |  |  | (195,767 | ) |  | 310,157 |
Goodwill from fiscal 2017 acquisition | 10,087 |  |  | — |  |  | 10,087 |
Purchase price allocation adjustments from fiscal 2016 acquisitions | 1,504 |  |  | — |  |  | 1,504 |
Balance as of July 29, 2017 | 517,515 |  |  | (195,767 | ) |  | 321,748 |
Purchase price allocation adjustments from fiscal 2017 acquisition | (5 | ) |  | — |  |  | (5 | )
Balance as of January 27, 2018 | $ | 517,510 |  |  | $ | (195,767 | ) |  | $ | 321,743 |
Impairment Calculation Rates | The table below outlines certain assumptions used in the Company’s quantitative impairment analyses for the 2018 transition period and fiscal 2017, 2016, and 2015:
| 2018 |  | 2017 |  | 2016 |  | 2015
Terminal Growth Rate | 2.5% - 3.0% |  | 2.0% - 3.0% |  | 2.0% - 3.0% |  | 1.5% - 2.5%
Discount Rate | 11.0% |  | 11.0% |  | 11.5% |  | 11.5%
Schedule of Intangible Assets | The Company’s intangible assets consisted of the following (dollars in thousands):
| Gross Carrying Amount |  | Accumulated Amortization |  | Intangible Assets, Net
January 27, 2018: |  |  |  |  |
Customer relationships | $ | 299,717 |  |  | $ | 135,544 |  |  | $ | 164,173 |
Trade names | 10,350 |  |  | 7,872 |  |  | 2,478 |
UtiliQuest trade name | 4,700 |  |  | — |  |  | 4,700 |
Non-compete agreements | 450 |  |  | 332 |  |  | 118 |
| $ | 315,217 |  |  | $ | 143,748 |  |  | $ | 171,469 |
July 29, 2017: |  |  |  |  |
Customer relationships | $ | 299,717 |  |  | $ | 124,084 |  |  | $ | 175,633 |
Trade names | 10,350 |  |  | 7,285 |  |  | 3,065 |
UtiliQuest trade name | 4,700 |  |  | — |  |  | 4,700 |
Non-compete agreements | 450 |  |  | 287 |  |  | 163 |
| $ | 315,217 |  |  | $ | 131,656 |  |  | $ | 183,561 |
July 30, 2016: |  |  |  |  |
Customer relationships | $ | 289,955 |  |  | $ | 101,012 |  |  | $ | 188,943 |
Trade names | 9,800 |  |  | 6,034 |  |  | 3,766 |
UtiliQuest trade name | 4,700 |  |  | — |  |  | 4,700 |
Non-compete agreements | 685 |  |  | 329 |  |  | 356 |
Contract backlog | 4,780 |  |  | 4,666 |  |  | 114 |
| $ | 309,920 |  |  | $ | 112,041 |  |  | $ | 197,879 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | As of January 27, 2018, total amortization expense for existing finite-lived intangible assets for the next five fiscal years and thereafter is as follows (dollars in thousands):
|  | Amount
2019 |  | $ | 21,656 |
2020 |  | 20,095 |
2021 |  | 19,208 |
2022 |  | 16,740 |
2023 |  | 14,294 |
Thereafter |  | 74,776 |
Total |  | $ | 166,769 |

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