Property, Plant, and Equipment (Tables)

12 Months Ended

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.