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Property, Plant and Equipment
 9 Months Ended
Jan. 31, 2022
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
The components of property, plant and equipment were:
 January 31,April 30,
(in thousands)20222021
Land$4,431 $4,431 
Buildings and improvements118,848 116,103 
Buildings and improvements - finance leases11,636 11,636 
Machinery and equipment325,219 315,371 
Machinery and equipment - finance leases31,094 31,386 
Construction in progress36,865 22,669 
528,093 501,596 
Less accumulated amortization and depreciation(319,365)(297,594)
Total$208,728 $204,002 

Amortization and depreciation expense on property, plant and equipment amounted to $9.2 million and $10.3 million for the three months ended January 31, 2022 and 2021, respectively, and $28.3 million and $32.5 million for the nine months ended January 31, 2022 and 2021, respectively. The nine months ended January 31, 2021 includes accelerated depreciation expense of $1.3 million, related to the closure of the plant located in Humboldt, Tennessee. There was no accelerated depreciation for the three months ended January 31, 2021. Accumulated amortization on finance leases included in the above table amounted to $32.7 million and $33.0 million as of January 31, 2022 and April 30, 2021, respectively.