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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. 28, 2017
Jan. 30, 2016
Jan. 28, 2017
Jan. 30, 2016
Apr. 30, 2016
Net sales:          
Net sales $ 115,719 $ 123,816 $ 442,857 $ 431,705  
Long-lived assets:          
Long-lived assets 66,951   66,951   $ 73,163
United States          
Net sales:          
Sales 94,174 101,200 363,766 347,278  
Long-lived assets:          
Long-lived assets 62,676   62,676   68,233
Outside U.S.          
Net sales:          
Sales 21,545 $ 22,616 79,091 $ 84,427  
Long-lived assets:          
Long-lived assets $ 4,275   $ 4,275   $ 4,930