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Intangible Assets, Goodwill and Other (Tables) | 12 Months Ended
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Jul. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets [Table Text Block] | The net book value of these assets was as follows:
| July 31, 2020 |  |  |  |  |  |  |  | July 31, 2019 |  |  |  |  |  |
| 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: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships and other | 9 |  | $ | 45,385 |  |  | $ | (32,670) |  |  | $ | 12,715 |  |  | 9 |  | $ | 46,595 |  |  | $ | (29,343) |  |  | $ | 17,252 |
Unamortized other intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tradenames | N/A |  | 9,619 |  |  | — |  |  | 9,619 |  |  | N/A |  | 18,871 |  |  | — |  |  | 18,871 |
Total |  |  | $ | 55,004 |  |  | $ | (32,670) |  |  | $ | 22,334 |  |  |  |  | $ | 65,466 |  |  | $ | (29,343) |  |  | $ | 36,123 |

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