Property, Plant, and Equipment (Tables)

12 Months Ended

Apr. 30, 2021

Property Plant And Equipment [Abstract]

Summary of Property, Plant, and Equipment

The following table summarizes property, plant, and equipment as of April 30, 2021 and 2020 (in thousands):

	April 30, 2021			April 30, 2020
Machinery and equipment	$	284,947		$	266,018
Software and hardware		46,648			45,710
Building and improvements		36,525			34,132
Land and improvements		2,817			3,787
Right of use assets		40,986			40,986
		411,923			390,633
Less: Accumulated depreciation and amortization		(277,862	)		(249,621	)
		134,061			141,012
Construction in progress		7,551			6,727
Total property, plant, and equipment, net	$	141,612		$	147,739

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, 2021, 2020, and 2019 (in thousands):

	For the Years Ended April 30,
	2021		2020		2019
Cost of sales	$	21,026	$	21,142	$	20,760
Research and development		519		584		545
Selling and marketing		533		446		530
General and administrative (a)		8,606		9,113		6,780
Interest expense		891		687		431
Total depreciation and amortization	$	31,575	$	31,972	$	29,046

(a) General and administrative expenses included $330,644, $344,527, and $286,261 of amortization for the fiscal years ended April 30, 2021, 2020, and 2019, respectively, which were recorded as a result of our acquisitions.