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Restructuring (narrative) (detail) - USD ($)
 3 Months Ended 12 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Mar. 31, 2017
Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]        
Plant Restructuring $ 81,000 $ 1,185,000    
NorthwestPlant2 [Member]        
Restructuring Cost and Reserve [Line Items]        
Plant Restructuring 81,000   $ 1,829,000 $ 10,302,000
Employee Severance [Member]        
Restructuring Cost and Reserve [Line Items]        
Plant Restructuring 36,000 127,000    
Employee Severance [Member] | NorthwestPlant2 [Member]        
Restructuring Cost and Reserve [Line Items]        
Plant Restructuring     1,578,000 162,000
Other Restructuring [Member]        
Restructuring Cost and Reserve [Line Items]        
Plant Restructuring 36,000 1,064,000    
Other Restructuring [Member] | NorthwestPlant2 [Member]        
Restructuring Cost and Reserve [Line Items]        
Plant Restructuring     384,000 5,075,000
Long Lived Asset Charges [Member]        
Restructuring Cost and Reserve [Line Items]        
Plant Restructuring $ 9,000 $ (6,000)    
Long Lived Asset Charges [Member] | NorthwestPlant2 [Member]        
Restructuring Cost and Reserve [Line Items]        
Plant Restructuring     $ 635,000 $ 5,065,000