Property, Plant, and Equipment (Tables)

12 Months Ended

Apr. 30, 2017

Property Plant And Equipment [Abstract]

Summary of Property, Plant, and Equipment

The following table summarizes property, plant, and equipment as of April 30, 2017 and 2016 (in thousands):

	April 30, 2017			April 30, 2016

Machinery and equipment	$	242,479		$	211,186
Software and hardware		39,526			34,642
Building and improvements		28,110			23,388
Land and improvements		3,573			3,235
		313,688			272,451
Less: Accumulated depreciation and amortization		(170,538	)		(142,137	)
		143,150			130,314
Construction in progress		6,535			5,091

Total property, plant, and equipment, net	$	149,685		$	135,405

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, 2017, 2016, and 2015 (in thousands):

	For the Year Ended April 30,
	2017		2016		2015
Cost of sales	$	24,744	$	22,332	$	20,640
Research and development		428		1,136		403
Selling and marketing		424		221		255
General and administrative (a)		23,699		14,869		8,134
Interest expense		918		2,679		1,461
Total depreciation and amortization	$	50,213	$	41,237	$	30,893

(a)	General and administrative expenses included $18.4 million, $9.9 million, and $3.6 million of amortization for the fiscal years ended April 30, 2017, 2016, and 2015, respectively, recorded as a result of our acquisitions.