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Long-Term Debt (Schedule Of Aggregate Maturities For Debt Outstanding) (Details) - USD ($)
$ in Thousands
Apr. 30, 2018
Jul. 31, 2017
Apr. 30, 2017
Debt Instrument [Line Items]      
2018 (May 2018 through July 2018) $ 9,535    
2019 38,455    
2020 38,516    
2021 38,580    
2022 573,023    
Thereafter 421,877    
Total debt $ 1,119,986 $ 1,276,521 $ 1,210,884