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Significant Customer and Other Information (Tables)
 6 Months Ended
Sep. 30, 2025
Significant Customer and Other Information [Abstract]  
Concentrations of Risk
Significant Customer Concentrations
 
The largest customers accounted for the following percentage of consolidated net sales:
 
                     
 
 Three Months Ended
September 30, 		 
 Six Months Ended
September 30, 		 
    
2025
    
2024
    
2025
    
2024
 
Net sales
                   
Customer A
  38%   34%   38%   37%
Customer B
  28%   21%   26%   20%
Customer C
  21%   31%   21%   29%
         
     September 30, 2025      March 31, 2025  
Accounts receivable - trade
         
Customer A
  36%   41%
Customer B
  34%   26%
Customer C
  7%   7%
                 
                     
 
 Three Months Ended
September 30, 		 
 Six Months Ended
September 30, 		 
    
2025
  
2024
    
2025
    
2024
 
Product line
                   
Rotating electrical products
  69%   68%   68%   67%
Brake-related products
  21%   21%   22%   22%
Wheel hub products
  6%   7%   6%   7%
Other products
  4%   4%   4%   4%
    100%   100%   100%   100%