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Segment Disclosure - Net Sales and Long-lived Assets by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 30, 2016
Jan. 31, 2015
Jan. 30, 2016
Jan. 31, 2015
May. 02, 2015
Net sales:          
Net sales $ 123,816 $ 118,123 $ 431,705 $ 457,856  
Long-lived assets:          
Long-lived assets 73,378   73,378   $ 72,844
United States          
Net sales:          
Sales 101,200 90,127 347,278 370,168  
Long-lived assets:          
Long-lived assets 68,640   68,640   67,882
Outside U.S.          
Net sales:          
Sales 22,616 $ 27,996 84,427 $ 87,688  
Long-lived assets:          
Long-lived assets $ 4,738   $ 4,738   $ 4,962