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Property, Plant, and Equipment (Tables) | 12 Months Ended
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Apr. 30, 2018
Property Plant And Equipment [Abstract] |
Summary of Property, Plant, and Equipment | The following table summarizes property, plant, and equipment as of April 30, 2018 and 2017 (in thousands):
| April 30, 2018 |  |  | April 30, 2017 |
Machinery and equipment | $ |  | 251,706 |  |  | $ |  | 242,479 |
Software and hardware |  |  | 43,097 |  |  |  |  | 39,526 |
Building and improvements |  |  | 29,908 |  |  |  |  | 28,110 |
Land and improvements |  |  | 3,845 |  |  |  |  | 3,573 |
|  |  | 328,556 |  |  |  |  | 313,688 |
Less: Accumulated depreciation and amortization |  |  | (198,545 | ) |  |  |  | (170,538 | )
|  |  | 130,011 |  |  |  |  | 143,150 |
Construction in progress |  |  | 29,114 |  |  |  |  | 6,535 |
Total property, plant, and equipment, net | $ |  | 159,125 |  |  | $ |  | 149,685 |
Summary of Depreciation and Amortization Expense | 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, 2018, 2017, and 2016 (in thousands):
| For the Years Ended April 30, |
| 2018 |  | 2017 |  | 2016 |
Cost of sales | $ |  | 24,582 |  | $ |  | 24,744 |  | $ |  | 22,332 |
Research and development |  |  | 557 |  |  |  | 428 |  |  |  | 1,136 |
Selling and marketing |  |  | 619 |  |  |  | 424 |  |  |  | 221 |
General and administrative (a) |  |  | 25,212 |  |  |  | 23,699 |  |  |  | 14,869 |
Interest expense |  |  | 1,105 |  |  |  | 918 |  |  |  | 2,679 |
Total depreciation and amortization | $ |  | 52,075 |  | $ |  | 50,213 |  | $ |  | 41,237 |
(a) | General and administrative expenses included $20.8 million, $18.4 million, and $9.9 million of amortization for the fiscal years ended April 30, 2018, 2017, and 2016, respectively, recorded as a result of our acquisitions.

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: 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 Reference 2: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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