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Fair Value Measurements (Fair Value Of Assets On Recurring Basis) (Details) - USD ($)
$ in Thousands
Apr. 30, 2023
Apr. 30, 2022
LEVEL 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets at fair value $ 191 $ 404
Interest Rate Cash Flow Hedge Asset at Fair Value 0 0
LEVEL 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets at fair value 13,885 13,687
Interest Rate Cash Flow Hedge Asset at Fair Value 13,885 13,687
LEVEL 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets at fair value 0 0
Interest Rate Cash Flow Hedge Asset at Fair Value 0 0
Fair Value, Recurring [Member] | Money Market Funds [Member] | LEVEL 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets at fair value 191  
Fair Value, Recurring [Member] | Money Market Funds [Member] | LEVEL 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets at fair value 0  
Fair Value, Recurring [Member] | Money Market Funds [Member] | LEVEL 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets at fair value $ 0  
Fair Value, Recurring [Member] | Mutual Funds [Member] | LEVEL 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets at fair value   404
Fair Value, Recurring [Member] | Mutual Funds [Member] | LEVEL 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets at fair value   0
Fair Value, Recurring [Member] | Mutual Funds [Member] | LEVEL 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets at fair value   $ 0