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Property, Plant and Equipment | 12 Months Ended
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Jul. 31, 2021
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment Property, plant and equipment consist of the following at July 31, 2021 and 2020:
|  | 2021 |  | 2020
Machinery and equipment |  | $ | 170,600,000 |  |  | 156,314,000 |
Leasehold improvements |  | 15,726,000 |  |  | 15,596,000 |
|  | 186,326,000 |  |  | 171,910,000 |
Less accumulated depreciation and amortization |  | 151,040,000 |  |  | 144,873,000 |
Property, plant and equipment, net |  | $ | 35,286,000 |  |  | 27,037,000 |
Depreciation and amortization expense on property, plant and equipment amounted to $9,343,000, $10,386,000 and $11,927,000 for the fiscal years ended July 31, 2021, 2020 and 2019, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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