Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 504,690	$ 464,021
Less: accumulated depreciation and amortization	193,364	158,554
Total property and equipment, net of accumulated depreciation	311,326	305,467
Depreciation expense	50,480	51,332	$ 46,456
Land
Property, Plant and Equipment [Line Items]
Total property and equipment	56,841	52,581
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	120,616	110,322
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	324,375	300,133
Construction in progress
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 2,858	$ 985