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Segment Information - International net sales (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
May 01, 2016
Jan. 31, 2016
Nov. 01, 2015
Aug. 02, 2015
May 03, 2015
Feb. 01, 2015
Nov. 02, 2014
Aug. 03, 2014
May 01, 2016
May 03, 2015
Apr. 27, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]                      
net sales $ 77,253 $ 78,466 $ 76,956 $ 80,185 $ 78,846 $ 81,269 $ 73,991 $ 76,060 $ 312,860 $ 310,166 $ 287,162
North america (excluding USA) [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
net sales [1]                 31,667 30,758 15,556
Far east and asia [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
net sales [2]                 31,927 31,855 33,487
All other areas [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
net sales                 4,336 4,720 6,041
International [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
net sales                 $ 67,930 $ 67,333 $ 55,084
[1] Of this amount, $24.2 million, $24.1 million, and $9.3 million are attributable to shipments to Mexico in fiscal 2016, 2015, and 2014, respectively.
[2] Of this amount $23.1 million, $26.5 million, and $32.2 million are attributable to shipment to China in fiscal 2016, 2015, and 2014, respectively.