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Investments - Available for sale securities (Details) - Available-for-sale securities
$ in Thousands
9 Months Ended
Jan. 25, 2020
USD ($)
Investments  
Sales or Purchases $ 18,147
Carrying Value 18,147
Amortized cost of available-for-sale securities by contractual maturity  
Due after 20 years 13,200
Total 13,200
Fair value of available-for-sale securities by contractual maturity  
Due after 20 years 13,200
Total $ 13,200
Minimum  
Fair value of available-for-sale securities by contractual maturity  
Variable rate demand notes long maturities 20 years
Maximum  
Fair value of available-for-sale securities by contractual maturity  
Variable rate demand notes long maturities 30 years
Investment in limited partnership fund  
Investments  
Sales or Purchases $ 4,947
Carrying Value 4,947
Variable rate demand notes  
Investments  
Sales or Purchases 13,200
Carrying Value $ 13,200
Put option | Minimum  
Fair value of available-for-sale securities by contractual maturity  
Variable rate demand notes long maturities 1 day
Put option | Maximum  
Fair value of available-for-sale securities by contractual maturity  
Variable rate demand notes long maturities 7 days