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Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 28, 2018
Apr. 29, 2017
Roll-forward of other intangible assets    
Balance at beginning of period $ 18,489 $ 8,558
Acquisitions 255 10,337
Impairment charges   (40)
Amortization (959) (463)
Translation adjustment 405 97
Balance at end of period 18,190 18,489
Reacquired Rights    
Roll-forward of other intangible assets    
Balance at beginning of period 524  
Acquisitions   829
Amortization (542) (336)
Translation adjustment 18 31
Balance at end of period   524
Other Intangible Assets    
Roll-forward of other intangible assets    
Balance at beginning of period 3,587  
Acquisitions   3,530
Amortization (417) (127)
Translation adjustment 220 184
Balance at end of period 3,390 3,587
Trade Names    
Roll-forward of other intangible assets    
Balance at beginning of period 1,155 1,195
Impairment charges   (40)
Balance at end of period 1,155 1,155
Reacquired Rights    
Roll-forward of other intangible assets    
Balance at beginning of period 13,223 7,363
Acquisitions 255 5,978
Translation adjustment 167 (118)
Balance at end of period $ 13,645 $ 13,223