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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Jan. 31, 2019
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Changes in Carrying Amount of Goodwill | Changes in the carrying amount of goodwill for the six months ended January 31, 2019, were as follows:
| IDS |  | WPS |  | Total
Balance as of July 31, 2018 | $ | 385,524 |  |  | $ | 34,291 |  |  | $ | 419,815 |
Translation adjustments | (2,178 | ) |  | (397 | ) |  | (2,575 | )
Balance as of January 31, 2019 | $ | 383,346 |  |  | $ | 33,894 |  |  | $ | 417,240 |
Other Intangible Assets | The net book value of these assets was as follows:
| January 31, 2019 |  | 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 |  |  | $ | (1,195 | ) |  | $ | 253 |  |  | 5 |  | $ | 1,448 |  |  | $ | (942 | ) |  | $ | 506 |
Trademarks and other | 10 |  | 2,467 |  |  | (2,398 | ) |  | 69 |  |  | 9 |  | 4,497 |  |  | (4,395 | ) |  | 102 |
Customer relationships | 8 |  | 48,465 |  |  | (28,607 | ) |  | 19,858 |  |  | 9 |  | 55,999 |  |  | (33,535 | ) |  | 22,464 |
Unamortized other intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks | N/A |  | 19,472 |  |  | — |  |  | 19,472 |  |  | N/A |  | 19,516 |  |  | — |  |  | 19,516 |
Total |  |  | $ | 71,852 |  |  | $ | (32,200 | ) |  | $ | 39,652 |  |  |  |  | $ | 81,460 |  |  | $ | (38,872 | ) |  | $ | 42,588 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 + Details
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