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Basis of Presentation and Summary of Critical Accounting Policies Principles of Consolidation (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 29, 2017
Jul. 30, 2016
Apr. 29, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Equity Method Investments $ 3,200   $ 2,678
Equity in loss of affiliate 85 $ 0  
Cost Method Investments $ 42   $ 42