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Segment Information - International net sales (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
May. 03, 2015
Feb. 01, 2015
Nov. 02, 2014
Aug. 03, 2014
Apr. 27, 2014
Jan. 26, 2014
Oct. 27, 2013
Jul. 28, 2013
May. 03, 2015
Apr. 27, 2014
Apr. 28, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]                      
net sales $ 78,846 $ 81,269 $ 73,991 $ 76,060 $ 74,043 $ 72,389 $ 70,589 $ 70,141 $ 310,166 $ 287,162 $ 268,814
North america (excluding USA) [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
net sales [1]                 30,758 15,556 11,900
Far east and asia [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
net sales [2]                 31,855 33,487 43,907
All other areas [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
net sales                 4,720 6,041 5,806
International [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
net sales                 $ 67,333 $ 55,084 $ 61,613
[1] Of this amount, $24.1 million, $9.3 million, and $3.2 million are attributable to shipments to Mexico in fiscal 2015, 2014, and 2013, respectively.
[2] Of this amount $26.5 million, $32.2 million, and $42.1 million are attributable to shipment to China in fiscal 2015, 2014, and 2013, respectively.