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Property, Plant, and Equipment
 12 Months Ended
Mar. 31, 2021
Property, Plant and Equipment, Net [Abstract]  
Property, Plant and Equipment Property, Plant, and Equipment
 
Consolidated property, plant, and equipment of the Company consisted of the following:
 March 31,
 20212020
Land and land improvements$4,787 $4,985 
Buildings39,941 39,930 
Machinery, equipment, and leasehold improvements229,161 228,140 
Construction in progress14,188 12,950 
 288,077 286,005 
Less accumulated depreciation213,324 206,532 
Net property, plant, and equipment$74,753 $79,473 
 
Depreciation expense was $15,530,000, $16,184,000, and $17,775,000 for the years ended March 31, 2021, 2020, and 2019, respectively.

Gross property, plant, and equipment includes capitalized software costs of $38,925,000 and $37,864,000 at March 31, 2021 and 2020, respectively.  Accumulated depreciation includes accumulated amortization on capitalized software costs of $27,207,000 and $22,962,000 at March 31, 2021 and 2020, respectively.  Amortization expense on capitalized software costs was $3,639,000, $2,937,000, and $3,045,000 during the years ended March 31, 2021, 2020, and 2019, respectively.