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Business Segments - Additional Information (Detail)
$ in Thousands
12 Months Ended
Mar. 31, 2021
USD ($)
segment
Country
Mar. 31, 2020
USD ($)
Mar. 31, 2019
Segment Reporting Information [Line Items]      
Number of operating segments | segment 3    
Number of reportable segments | segment 3    
Operations in number of countries | Country 100    
Property, plant, and equipment, net $ 497,056 $ 480,014  
United States      
Segment Reporting Information [Line Items]      
Percentage of sales to customers 59.80% 58.10% 48.50%
Property, plant, and equipment, net $ 291,578 $ 277,358  
Energy Systems      
Segment Reporting Information [Line Items]      
Property, plant, and equipment, net 224,513 182,122  
Motive Power      
Segment Reporting Information [Line Items]      
Property, plant, and equipment, net 152,468 153,438  
Specialty      
Segment Reporting Information [Line Items]      
Property, plant, and equipment, net $ 120,075 $ 144,454