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Basis of Presentation and Summary of Critical Accounting Policies Principles of Consolidation (Details) - USD ($)
$ in Thousands
9 Months Ended
Jan. 28, 2017
Apr. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Equity Method Investments $ 2,464 $ 0
Income (Loss) from Equity Method Investments 79  
Cost Method Investments $ 42 $ 1,211