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Plant Restructuring (table) (detail) - USD ($)
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Restructuring Cost and Reserve [Line Items]        
Balance $ 1,249,000 $ 10,000 $ 1,501,000  
Plant Restructuring 10,302,000 1,376,000 501,000 $ 3,500,000
Cash payment/write offs (2,679,000) (137,000) 1,992,000  
Balance 8,872,000 1,249,000 10,000 1,501,000
Employee Severance [Member]        
Restructuring Cost and Reserve [Line Items]        
Balance 715,000 10,000 20,000  
Plant Restructuring 162,000 842,000    
Cash payment/write offs (877,000) (137,000) 10,000  
Balance 0 715,000 10,000 20,000
Long Lived Asset Charges [Member]        
Restructuring Cost and Reserve [Line Items]        
Balance 264,000 0 1,174,000  
Plant Restructuring 5,065,000 264,000 341,000  
Cash payment/write offs (354,000)   (1,515,000)  
Balance 4,975,000 264,000 0 1,174,000
Other Restructuring [Member]        
Restructuring Cost and Reserve [Line Items]        
Balance 270,000 0 307,000  
Plant Restructuring 5,075,000 270,000 160,000  
Cash payment/write offs (1,448,000)   (467,000)  
Balance $ 3,897,000 $ 270,000 $ 0 $ 307,000