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v3.20.1

Impairment Charges (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jan. 31, 2020 USD ($) ft² | Jan. 31, 2020 USD ($) ft² | Jan. 31, 2019 USD ($) | Jul. 31, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Impairment charges | $ 10,057 | $ 10,057 | $ 0 |
Assets |  |  |  |
Total assets held for sale | $ 10,680 | $ 10,680 |  | $ 0
Held-for-sale |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Area of property (in sq ft) | ft² | 400,000 | 400,000 |  |
Assets |  |  |  |
Accounts receivable | $ 915 | $ 915 |  |
Inventory | 2,959 | 2,959 |  |
Property, plant and equipment | 6,772 | 6,772 |  |
Other assets | 34 | 34 |  |
Total assets held for sale | 10,680 | 10,680 |  |
Liabilities |  |  |  |
Accrued product warranties | 556 | 556 |  |
Other accrued liabilities | 131 | 131 |  |
Total liabilities held for sale | $ 687 | $ 687 |  |

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