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Goodwill and Intangible Assets | 3 Months Ended
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Oct. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Goodwill and Other Intangible Assets 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 |
Goodwill is presented net of accumulated impairment losses, with the most recent impairment charge being incurred in fiscal 2015. There were no impairment charges recorded during the three months ended October 31, 2018. Other intangible assets include patents, trademarks, and customer relationships with finite lives being amortized in accordance with the accounting guidance for other intangible assets. The Company also has unamortized indefinite-lived trademarks that are classified as 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 |
The decrease in the gross carrying amount of other intangible assets as of October 31, 2018 compared to July 31, 2018 was due to the effects of currency fluctuations during the three-month period. Amortization expense on intangible assets was $1,436 and $1,693 for the three months ended October 31, 2018 and 2017, respectively. Amortization expense over each of the next five fiscal years is projected to be $5,713, $5,187, $5,148, $5,004 and $2,025 for the fiscal years ending July 31, 2019, 2020, 2021, 2022 and 2023, respectively.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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