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Property, Plant, and Equipment | 12 Months Ended
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Apr. 30, 2018
Property Plant And Equipment [Abstract] |
Property, Plant, and Equipment | 8. 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 |
Depreciation of tangible assets and amortization of software expense amounted to $30.0 million, $29.2 million, and $27.8 million for the fiscal years ended April 30, 2018, 2017, and 2016, respectively. The large increase in construction in progress is due to the costs incurred for the purchase of land and costs related to the design and construction of our national logistics facility. 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 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 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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