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Segment Information - Balance Sheet Information by Operating Segments (Detail) - USD ($)
$ in Thousands
 3 Months Ended 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
Apr. 30, 2017
May 01, 2016
May 03, 2015
Apr. 27, 2014
Segment Reporting Information [Line Items]                        
cash and cash equivalents $ 20,795       $ 37,787       $ 20,795 $ 37,787 $ 29,725 $ 29,303
short-term investments 2,443       4,359       2,443 4,359    
non-compete agreements, net 828       903       828 903    
income taxes receivable         155         155    
customer relationships 664       715       664 715    
deferred income taxes 419       2,319       419 2,319    
goodwill 11,462       11,462       11,462 11,462 11,462 $ 11,462
other current assets 2,894       2,477       2,894 2,477    
investment in unconsolidated joint venture 1,106               1,106      
property, plant and equipment 51,651 $ 50,333 $ 45,537 $ 41,745 39,973 $ 38,157 $ 38,319 $ 37,480 51,651 39,973    
long-term investments - held-to-maturity 30,945               30,945      
total assets 205,634 191,056 179,127 183,360 175,142 173,551 168,947 166,880 205,634 175,142 171,300  
long-term investments - rabbi trust 5,466       4,025       5,466 4,025    
capital expenditures 3,097 6,590 5,541 3,543 3,631 1,542 2,575 2,960 18,771 [1] 10,708 [1] 11,174 [1]  
other assets 2,394       2,573       2,394 2,573    
depreciation expense 1,781 $ 1,793 $ 1,751 $ 1,761 1,783 $ 1,705 $ 1,629 $ 1,555 7,085 6,671 5,773  
Mattress Fabrics [Member]                        
Segment Reporting Information [Line Items]                        
goodwill 11,462       11,462       11,462 11,462    
Operating Segments [Member]                        
Segment Reporting Information [Line Items]                        
total assets 140,914       122,136       140,914 122,136 119,680  
Operating Segments [Member] | Mattress Fabrics [Member]                        
Segment Reporting Information [Line Items]                        
current assets [2] 47,038       43,472       47,038 43,472 41,328  
non-compete agreements, net 828       903       828 903 979  
customer relationships 664       715       664 715 766  
goodwill 11,462       11,462       11,462 11,462 11,462  
investment in unconsolidated joint venture 1,106               1,106      
property, plant and equipment 48,916 [3]       37,480 [4]       48,916 [3] 37,480 [4] 33,773 [5]  
total assets 110,014       94,032       110,014 94,032 88,308  
capital expenditures                 17,689 9,666 10,454  
depreciation expense                 6,245 5,837 5,034  
Operating Segments [Member] | Upholstery Fabrics [Member]                        
Segment Reporting Information [Line Items]                        
current assets [2] 29,021       26,540       29,021 26,540 29,905  
property, plant and equipment 1,879 [6]       1,564 [7]       1,879 [6] 1,564 [7] 1,467 [8]  
total assets 30,900       28,104       30,900 28,104 31,372  
capital expenditures                 822 626 468  
depreciation expense                 840 834 739  
Unallocated corporate [Member]                        
Segment Reporting Information [Line Items]                        
cash and cash equivalents 20,795       37,787       20,795 37,787 29,725  
short-term investments 2,443       4,359       2,443 4,359 10,004  
income taxes receivable         155         155 229  
deferred income taxes 419       2,319       419 2,319 5,169  
other current assets 2,894       2,477       2,894 2,477 2,440  
property, plant and equipment [9] 856       929       856 929 838  
long-term investments - held-to-maturity 30,945               30,945      
long-term investments - rabbi trust 5,466       4,025       5,466 4,025 2,415  
capital expenditures                 260 416 252  
other assets $ 902       $ 955       $ 902 $ 955 $ 800  
[1] Capital expenditure amounts are stated on an accrual basis. See Consolidated Statement of Cash Flows for capital expenditure amounts on a cash basis.
[2] Current assets represent accounts receivable and inventory.
[3] The $48.9 million at April 30, 2017, represents property, plant, and equipment located in the U.S. of $34.0 million and located in Canada of $14.9 million.
[4] The $37.5 million at May 1, 2016, represents property, plant, and equipment located in the U.S. of $24.8 million and located in Canada of $12.7 million.
[5] The $33.8 million at May 3, 2015, represents property, plant, and equipment located in the U.S. of $23.8 million and located in Canada of $10.0 million.
[6] The $1.9 million at April 30, 2017, represents property, plant, and equipment located in the U.S. of $1.2 million and located in China of $655.
[7] The $1.6 million at May 1, 2016, represents property, plant, and equipment located in the U.S. of $893 and located in China of $671.
[8] The $1.5 million at May 3, 2015, represents property, plant, and equipment located in the U.S. of $848 and located in China of $619.
[9] The $856, $929, and $838 balance at April 30, 2017, May 1, 2016, and May 3, 2015, represent property, plant, and equipment associated with unallocated corporate departments and corporate departments shared by both the mattress and upholstery fabric segments.