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Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 27, 2018
Jan. 28, 2017
Jan. 27, 2018
Jan. 28, 2017
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     $ (61,422) $ (36,886)    
Cash flows from operating activities     91,200 93,014    
Cash, cash equivalents and restricted cash $ 137,620 $ 119,311 137,620 119,311 $ 150,859 $ 121,335
Net cash provided by (used for) investing activities     (45,221) (58,013)    
Operating income 33,095 33,572 83,662 89,888    
Other income (expense), net $ (1,094) (52) $ (2,475) (1,783)    
Accounting Standards Update 2016-09 - Stock Compensation            
Accounting pronouncements adopted in fiscal 2018            
Cash flows from financing activities       1,800    
Cash flows from operating activities       (1,800)    
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   2,100    
Other income (expense), net   $ (700)   $ (2,100)