Segment Information - Balance Sheet Information by Operating Segments (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Jan. 29, 2017
Jan. 31, 2016
Oct. 30, 2016
May 01, 2016
May 03, 2015
Segment Reporting Information [Line Items]          
Non-compete agreement $ 847 $ 922   $ 903  
Customer relationships 677 728   715  
Investment in unconsolidated joint venture 600        
Goodwill 11,462 11,462   11,462 [1]  
Property, plant and equipment 50,333 38,157   39,973 [1]  
Total assets 191,056 173,551   175,142 [1]  
Cash and cash equivalents 15,659 31,713   37,787 [1] $ 29,725
Short-term investments 2,410 4,259   4,359 [1]  
Deferred income taxes 422 4,312   2,319 [1]  
Income taxes receivable   23   155 [1]  
Other current assets 2,514 2,331   2,477 [1]  
Long-term investments (Held-to-Maturity) 30,832   $ 31,000    
Long-term investments (Rabbi Trust) 5,488 3,590   4,025 [1]  
Other assets 2,417 2,435   2,573 [1]  
Capital expenditures [2] 15,674 7,077      
Depreciation expense 5,304 4,888      
Unallocated corporate [Member]          
Segment Reporting Information [Line Items]          
Property, plant and equipment [3] 752 930   929  
Cash and cash equivalents 15,659 31,713   37,787  
Short-term investments 2,410 4,259   4,359  
Deferred income taxes 422 4,312   2,319  
Income taxes receivable   23   155  
Other current assets 2,514 2,331   2,477  
Long-term investments (Held-to-Maturity) 30,832        
Long-term investments (Rabbi Trust) 5,488 3,590   4,025  
Other assets 893 785   955  
Capital expenditures 72 381      
Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Total assets 132,086 125,608   122,136  
Operating Segments [Member] | Mattress Fabrics [Member]          
Segment Reporting Information [Line Items]          
Current assets [4] 41,498 44,309   43,472  
Non-compete agreement 847 922   903  
Customer relationships 677 728   715  
Investment in unconsolidated joint venture 600        
Goodwill 11,462 11,462   11,462  
Property, plant and equipment [5] 47,755 35,637   37,480  
Total assets 102,839 93,058   94,032  
Capital expenditures 14,957 6,215      
Depreciation expense 4,673 4,273      
Operating Segments [Member] | Upholstery Fabrics [Member]          
Segment Reporting Information [Line Items]          
Current assets [4] 27,421 30,960   26,540  
Property, plant and equipment [6] 1,826 1,590   1,564  
Total assets 29,247 32,550   $ 28,104  
Capital expenditures 645 481      
Depreciation expense $ 631 $ 615      
[1] Derived from audited financial statements.
[2] Capital expenditure amounts are stated on the accrual basis. See Consolidated Statements of Cash Flows for capital expenditure amounts on a cash basis.
[3] The $752, $930, and $929 at January 29, 2017, January 31, 2016 and May 1, 2016, respectively, represent property, plant, and equipment associated with unallocated corporate departments and corporate departments shared by both the mattress and upholstery fabric segments. Property, plant, and equipment associated with corporate are located in the U.S.
[4] Current assets represent accounts receivable and inventory for the respective segment.
[5] The $47.8 million at January 29, 2017, represents property, plant, and equipment of $32.6 million and $15.2 million located in the U.S. and Canada, respectively. The $35.6 million at January 31, 2016, represents property, plant, and equipment of $23.0 million and $12.6 million located in the U.S. and Canada, respectively. The $37.5 million at May 1, 2016, represents property, plant, and equipment of $24.8 million and $12.7 million located in the U.S. and Canada, respectively.
[6] The $1.8 million at January 29, 2017, represents property, plant, and equipment of $1.1 million and $711 located in the U.S. and China, respectively. The $1.6 million at January 31, 2016, represents property, plant, and equipment of $860 and $730 located in the U.S. and China, respectively. The $1.6 million at May 1, 2016, represents property, plant, and equipment of $893 and $671 located in the U.S. and China, respectively.