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Revenue - Disaggregation of Revenue (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 27, 2019
Jan. 28, 2018
Jan. 27, 2019
Jan. 28, 2018
Disaggregation of Revenue [Line Items]        
Total Net Sales $ 77,226 $ 85,310 $ 225,705 $ 245,541
Transferred at Point in Time [Member] | Product [Member]        
Disaggregation of Revenue [Line Items]        
Total Net Sales 74,852   217,704  
Transferred over Time [Member] | Services [Member]        
Disaggregation of Revenue [Line Items]        
Total Net Sales 2,374   8,001  
Mattress Fabrics [Member]        
Disaggregation of Revenue [Line Items]        
Total Net Sales 35,732   107,335  
Mattress Fabrics [Member] | Transferred at Point in Time [Member] | Product [Member]        
Disaggregation of Revenue [Line Items]        
Total Net Sales 35,732   107,335  
Upholstery Fabrics [Member]        
Disaggregation of Revenue [Line Items]        
Total Net Sales 37,104   106,611  
Upholstery Fabrics [Member] | Transferred at Point in Time [Member] | Product [Member]        
Disaggregation of Revenue [Line Items]        
Total Net Sales 34,730   98,610  
Upholstery Fabrics [Member] | Transferred over Time [Member] | Services [Member]        
Disaggregation of Revenue [Line Items]        
Total Net Sales 2,374   8,001  
Home Accessories [Member]        
Disaggregation of Revenue [Line Items]        
Total Net Sales 4,390   11,759  
Home Accessories [Member] | Transferred at Point in Time [Member] | Product [Member]        
Disaggregation of Revenue [Line Items]        
Total Net Sales $ 4,390   $ 11,759