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Plant and Equipment - Plant and Equipment (Details) - USD ($)
Mar. 31, 2025
Mar. 31, 2024
Plant and Equipment [Abstract]    
Plant and equipment, gross $ 110,065,000 $ 111,621,000
Less: accumulated depreciation (78,075,000) (73,283,000)
Total plant and equipment 31,990,000 38,338,000
Machinery and Equipment [Member]    
Plant and Equipment [Abstract]    
Plant and equipment, gross 62,330,000 63,048,000
Office Equipment and Fixtures [Member]    
Plant and Equipment [Abstract]    
Plant and equipment, gross 34,250,000 33,463,000
Leasehold Improvements [Member]    
Plant and Equipment [Abstract]    
Plant and equipment, gross $ 13,485,000 $ 15,110,000