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Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2017
Jan. 29, 2017
Oct. 30, 2016
Jul. 31, 2016
May 01, 2016
Jan. 31, 2016
Nov. 01, 2015
Aug. 02, 2015
Property, Plant and Equipment [Line Items]                
land and improvements $ 836       $ 836      
buildings and improvements 19,071       16,126      
leasehold improvements 1,541       1,340      
machinery and equipment 67,709       64,114      
office furniture and equipment 8,936       8,212      
capital projects in progress 12,901       2,896      
property, plant and equipment, gross 110,994       93,524      
accumulated depreciation and amortization (59,343)       (53,551)      
property, plant and equipment, net $ 51,651 $ 50,333 $ 45,537 $ 41,745 $ 39,973 $ 38,157 $ 38,319 $ 37,480
land and improvements [Member] | Minimum [Member]                
Property, Plant and Equipment [Line Items]                
depreciable lives 0 years              
land and improvements [Member] | Maximum [Member]                
Property, Plant and Equipment [Line Items]                
depreciable lives 10 years              
buildings and improvements [Member] | Minimum [Member]                
Property, Plant and Equipment [Line Items]                
depreciable lives 7 years              
buildings and improvements [Member] | Maximum [Member]                
Property, Plant and Equipment [Line Items]                
depreciable lives 40 years              
leasehold improvements [Member]                
Property, Plant and Equipment [Line Items]                
depreciable lives Shorter of life of lease or useful life.              
machinery and equipment [Member] | Minimum [Member]                
Property, Plant and Equipment [Line Items]                
depreciable lives 3 years              
machinery and equipment [Member] | Maximum [Member]                
Property, Plant and Equipment [Line Items]                
depreciable lives 12 years              
office furniture and equipment [Member] | Minimum [Member]                
Property, Plant and Equipment [Line Items]                
depreciable lives 3 years              
office furniture and equipment [Member] | Maximum [Member]                
Property, Plant and Equipment [Line Items]                
depreciable lives 10 years