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Investments (Details) - USD ($)
$ in Thousands
Dec. 29, 2018
Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]    
Debt Securities, Available-for-sale $ 14,445 $ 16,181
Marketable Equity Securities (FV-NI) 9,572  
Marketable Equity Securities   10,405
Equity Method Investments 19,666 18,853
Investments 43,683 45,439
Payments to acquire interest in joint venture $ 15,000 $ 15,000