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Summary of Significant Accounting Policies - Other Non-current Liabilities (Details)
$ in Thousands
12 Months Ended
Apr. 29, 2016
USD ($)
facility
Jul. 28, 2017
USD ($)
Apr. 28, 2017
USD ($)
Accounting Policies [Abstract]      
Deferred rent   $ 1,265 $ 1,091
Contingent consideration (1)   23,903 0
Non-current deferred gain (2)   2,131 2,192
Self-insurance reserves, noncurrent   2,357 2,814
Total other non-current liabilities   $ 29,656 $ 6,097
Number of properties | facility 2    
Lease term (in years) 20 years    
Non-current deferred sale leaseback gains $ 2,305