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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Oct. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | Changes in the carrying amount of goodwill for the three months ended October 31, 2018, were as follows:
| IDS |  | WPS |  | Total
Balance as of July 31, 2018 | $ | 385,524 |  |  | $ | 34,291 |  |  | $ | 419,815 |
Translation adjustments | (3,569 | ) |  | (1,117 | ) |  | (4,686 | )
Balance as of October 31, 2018 | $ | 381,955 |  |  | $ | 33,174 |  |  | $ | 415,129 |
Schedule of Other Intangible Assets | The net book value of these assets was as follows:
| October 31, 2018 |  | July 31, 2018
| Weighted Average Amortization Period (Years) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value |  | Weighted Average Amortization Period (Years) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value
Amortized other intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Patents | 5 |  | $ | 1,448 |  |  | $ | (1,069 | ) |  | $ | 379 |  |  | 5 |  | $ | 1,448 |  |  | $ | (942 | ) |  | $ | 506 |
Trademarks and other | 9 |  | 4,416 |  |  | (4,332 | ) |  | 84 |  |  | 9 |  | 4,497 |  |  | (4,395 | ) |  | 102 |
Customer relationships | 9 |  | 55,559 |  |  | (34,418 | ) |  | 21,141 |  |  | 9 |  | 55,999 |  |  | (33,535 | ) |  | 22,464 |
Unamortized other intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks | N/A |  | 19,429 |  |  | — |  |  | 19,429 |  |  | N/A |  | 19,516 |  |  | — |  |  | 19,516 |
Total |  |  | $ | 80,852 |  |  | $ | (39,819 | ) |  | $ | 41,033 |  |  |  |  | $ | 81,460 |  |  | $ | (38,872 | ) |  | $ | 42,588 |

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