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Property, Plant and Equipment | 6 Months Ended
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Oct. 31, 2021
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment The components of property, plant and equipment were:
|  | October 31, |  | April 30,
(in thousands) |  | 2021 |  | 2021
Land |  | $ | 4,431 |  |  | $ | 4,431 |
Buildings and improvements |  | 117,566 |  |  | 116,103 |
Buildings and improvements - finance leases |  | 11,636 |  |  | 11,636 |
Machinery and equipment |  | 326,474 |  |  | 315,371 |
Machinery and equipment - finance leases |  | 31,232 |  |  | 31,386 |
Construction in progress |  | 32,096 |  |  | 22,669 |
|  | 523,435 |  |  | 501,596 |
Less accumulated amortization and depreciation |  | (314,739) |  |  | (297,594) |
Total |  | $ | 208,696 |  |  | $ | 204,002 |
Amortization and depreciation expense on property, plant and equipment amounted to $9.4 million and $10.6 million for the three months ended October 31, 2021 and 2020, respectively, and $19.1 million and $22.2 million for the six months ended October 31, 2021 and 2020, respectively. The three and six months ended October 31, 2020 includes accelerated depreciation expense of $0.2 million and $1.3 million, respectively, related to the closure of the plant located in Humboldt, Tennessee. Accumulated amortization on finance leases included in the above table amounted to $32.9 million and $33.0 million as of October 31, 2021 and April 30, 2021, 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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