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Property, Plant and Equipment | 9 Months Ended
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Jan. 31, 2018
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment The components of property, plant and equipment were:
| January 31 |  | April 30
(in thousands) | 2018 |  | 2017
Land | $ | 4,751 |  |  | $ | 3,581 |
Buildings and improvements | 93,902 |  |  | 81,172 |
Buildings and improvements - capital leases | 11,203 |  |  | 11,202 |
Machinery and equipment | 268,063 |  |  | 187,836 |
Machinery and equipment - capital leases | 29,918 |  |  | 29,378 |
Construction in progress | 28,600 |  |  | 10,838 |
| 436,437 |  |  | 324,007 |
Less accumulated amortization and depreciation | (225,809 | ) |  | (216,074 | )
Total | $ | 210,628 |  |  | $ | 107,933 |
Amortization and depreciation expense on property, plant and equipment amounted to $12.9 million and $10.5 million for the nine months ended January 31, 2018 and 2017, respectively. Accumulated amortization on capital leases included in the above table amounted to $30.0 million and $29.7 million as of January 31, 2018 and April 30, 2017, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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