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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Jul. 29, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | Changes in the carrying amount of goodwill for fiscal 2017 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 |
Impairment Calculation Rates | The table below outlines certain assumptions used in the Company’s fiscal 2017, 2016, and 2015 annual quantitative impairment analyses:
| 2017 |  | 2016 |  | 2015
Terminal Growth Rate | 2.0% - 3.0% |  | 2.0% - 3.0% |  | 1.5% - 2.5%
Discount Rate | 11.0% |  | 11.5% |  | 11.5%
Schedule of Intangible Assets | The Company’s intangible assets consisted of the following (dollars in thousands):
| July 29, 2017 |  | July 30, 2016
| Weighted Average Remaining Useful Lives (Years) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Intangible Assets, Net |  | Gross Carrying Amount |  | Accumulated Amortization |  | Intangible Assets, Net
Customer relationships | 12.1 |  | $ | 299,717 |  |  | $ | 124,084 |  |  | $ | 175,633 |  |  | $ | 289,955 |  |  | $ | 101,012 |  |  | $ | 188,943 |
Trade names | 7.7 |  | 10,350 |  |  | 7,285 |  |  | 3,065 |  |  | 9,800 |  |  | 6,034 |  |  | 3,766 |
UtiliQuest trade name | — |  | 4,700 |  |  | — |  |  | 4,700 |  |  | 4,700 |  |  | — |  |  | 4,700 |
Non-compete agreements | 2.5 |  | 450 |  |  | 287 |  |  | 163 |  |  | 685 |  |  | 329 |  |  | 356 |
Contract backlog | — |  | — |  |  | — |  |  | — |  |  | 4,780 |  |  | 4,666 |  |  | 114 |
|  |  | $ | 315,217 |  |  | $ | 131,656 |  |  | $ | 183,561 |  |  | $ | 309,920 |  |  | $ | 112,041 |  |  | $ | 197,879 |
Future Amortization Expense | As of July 29, 2017, total amortization expense for existing finite-lived intangible assets for each of the five succeeding fiscal years and thereafter is as follows (dollars in thousands):
|  | Amount
2018 |  | $ | 23,113 |
2019 |  | 20,757 |
2020 |  | 19,847 |
2021 |  | 18,452 |
2022 |  | 14,899 |
Thereafter |  | 81,793 |
Total |  | $ | 178,861 |

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