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Property, Plant, and Equipment | 12 Months Ended
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Apr. 30, 2021
Property Plant And Equipment [Abstract] |
Property, Plant, and Equipment | 9. Property, Plant, and Equipment The following table summarizes property, plant, and equipment as of April 30, 2021 and 2020 (in thousands):
| April 30, 2021 |  | April 30, 2020 |
Machinery and equipment | $ |  | 284,947 |  | $ |  | 266,018 |
Software and hardware |  |  | 46,648 |  |  |  | 45,710 |
Building and improvements |  |  | 36,525 |  |  |  | 34,132 |
Land and improvements |  |  | 2,817 |  |  |  | 3,787 |
Right of use assets |  |  | 40,986 |  |  |  | 40,986 |
|  |  | 411,923 |  |  |  | 390,633 |
Less: Accumulated depreciation and amortization |  |  | (277,862 | ) |  |  | (249,621 | )
|  |  | 134,061 |  |  |  | 141,012 |
Construction in progress |  |  | 7,551 |  |  |  | 6,727 |
Total property, plant, and equipment, net | $ |  | 141,612 |  | $ |  | 147,739 |
Depreciation of tangible assets and amortization of software expense amounted to $30.1 million, $30.5 million, and $28.1 million for the fiscal years ended April 30, 2021, 2020, and 2019, respectively. The following table summarizes depreciation and amortization expense, which includes amortization of intangibles and debt financing costs, by line item for the fiscal years ended April 30, 2021, 2020, and 2019 (in thousands):
| For the Years Ended April 30, |
| 2021 |  | 2020 |  | 2019 |
Cost of sales | $ |  | 21,026 |  | $ |  | 21,142 |  | $ |  | 20,760 |
Research and development |  |  | 519 |  |  |  | 584 |  |  |  | 545 |
Selling and marketing |  |  | 533 |  |  |  | 446 |  |  |  | 530 |
General and administrative (a) |  |  | 8,606 |  |  |  | 9,113 |  |  |  | 6,780 |
Interest expense |  |  | 891 |  |  |  | 687 |  |  |  | 431 |
Total depreciation and amortization | $ |  | 31,575 |  | $ |  | 31,972 |  | $ |  | 29,046 |
(a) | General and administrative expenses included $330,644, $344,527, and $286,261 of amortization for the fiscal years ended April 30, 2021, 2020, and 2019, respectively, which were recorded as a result of our acquisitions.

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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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