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Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 28, 2017
Oct. 29, 2016
Oct. 28, 2017
Oct. 29, 2016
Apr. 29, 2017
Apr. 30, 2016
Accounting pronouncements adopted in fiscal 2018            
Unrecognized excess tax benefits from share-based payments         $ 0  
Cash flows from financing activities     $ (41,115) $ (26,594)    
Cash flows from operating activities     51,224 54,103    
Cash, cash equivalents and restricted cash $ 124,697 $ 114,558 124,697 114,558 $ 150,859 $ 121,335
Net cash provided by (used for) investing activities     (37,136) (34,137)    
Operating income 34,269 33,858 50,567 56,316    
Other income (expense), net $ (926) (969) $ (1,381) (1,731)    
Accounting Standards Update 2016-09 - Stock Compensation            
Accounting pronouncements adopted in fiscal 2018            
Cash flows from financing activities       1,700    
Cash flows from operating activities       (1,700)    
Accounting Standards Update 2016-18 - Restricted Cash | Early Adoption, Effect            
Accounting pronouncements adopted in fiscal 2018            
Cash, cash equivalents and restricted cash   9,000   9,000    
Accounting Standards Update 2016-18 - Restricted Cash | Maximum | Early Adoption, Effect            
Accounting pronouncements adopted in fiscal 2018            
Net cash provided by (used for) investing activities       100    
Accounting Standards Update 2017-07 - Pension Costs | Early Adoption, Effect            
Accounting pronouncements adopted in fiscal 2018            
Operating income   700   1,400    
Other income (expense), net   $ (700)   $ (1,400)