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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 09, 2015
Apr. 29, 2017
Apr. 30, 2016
Jan. 31, 2015
Operating Leases        
Rent expense   $ 11,599 $ 10,650  
Loss contingency trial start date   Mar. 02, 2015    
Loss contingency trial end date   Mar. 06, 2015    
Trial award against defendants to the action $ 11,887      
Accrued amount of litigation       $ 4,000