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Valuation and Qualifying Accounts and Reserves (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Jul. 31, 2024 | Jul. 31, 2023 | Jul. 31, 2022 | Jul. 31, 2021
Allowance for doubtful accounts receivable |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at beginning of period | $ 1,932,000 | $ 2,089,000 | $ 2,337,000 | $ 1,648,000
Charged to cost and expenses | 1,422,000 | 261,000 | 838,000 |
Transfers (deductions) | (1,579,000) | (509,000) | (149,000) |
Balance at end of period | 1,932,000 | 2,089,000 | 2,337,000 |
Inventory reserves |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at beginning of period | 18,271,000 | 24,659,000 | 23,121,000 | 20,229,000
Charged to cost and expenses | 2,801,000 | 4,871,000 | 4,447,000 |
Transfers (deductions) | (9,189,000) | (3,333,000) | (1,555,000) |
Balance at end of period | 18,271,000 | 24,659,000 | 23,121,000 |
Valuation allowance for deferred tax assets |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at beginning of period | 44,888,000 | 34,478,000 | 31,227,000 | $ 28,384,000
Charged to cost and expenses | 12,343,000 | 4,617,000 | 2,947,000 |
Transfers (deductions) | (1,933,000) | (1,366,000) | (104,000) |
Balance at end of period | $ 44,888,000 | $ 34,478,000 | $ 31,227,000 |

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4 + Details
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- Definition Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column C)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4 + Details
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- Definition Amount of decrease in valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column D)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4 + Details
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