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Segment Information - International net sales (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
Revenues from External Customers and Long-Lived Assets [Line Items]                      
net sales $ 77,350 $ 76,169 $ 75,343 $ 80,682 $ 77,253 $ 78,466 $ 76,956 $ 80,185 $ 309,544 $ 312,860 $ 310,166
North america (excluding USA) [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
net sales [1]                 29,995 31,667 30,758
Far east and asia [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
net sales [2]                 34,695 31,927 31,855
All other areas [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
net sales                 3,618 4,336 4,720
International [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
net sales                 $ 68,308 $ 67,930 $ 67,333
[1] Of this amount, $22.3 million, $24.2 million, and $24.1 million are attributable to shipments to Mexico in fiscal 2017, 2016, and 2015, respectively.
[2] Of this amount $26.6 million, $23.1 million, and $26.5 million are attributable to shipment to China in fiscal 2017, 2016, and 2015, respectively.