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Property, Plant and Equipment
 6 Months Ended
Oct. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
The components of property, plant and equipment were:
 October 31,April 30,
(in thousands)20202020
Land$4,431 $4,431 
Buildings and improvements121,743 120,819 
Buildings and improvements - finance leases11,636 11,636 
Machinery and equipment305,692 312,806 
Machinery and equipment - finance leases30,870 30,911 
Construction in progress13,313 8,164 
487,685 488,767 
Less accumulated amortization and depreciation(288,790)(284,943)
Total$198,895 $203,824 

Amortization and depreciation expense on property, plant and equipment amounted to $10.6 million and $9.2 million for the three months ended October 31, 2020 and 2019, respectively, and $22.2 million and $18.3 million for the six months ended October 31, 2020 and 2019, respectively. The three and six months ended October 31, 2020 includes accelerated depreciation expense of $0.2 million and $1.3 million, respectively, related to the closure of the plant located in Humboldt, Tennessee. Accumulated amortization on finance leases included in the above table amounted to $32.5 million and $32.3 million as of October 31, 2020 and April 30, 2020, respectively.