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Long-Term Debt (Schedule Of Aggregate Maturities For Debt Outstanding) (Details) - USD ($)
$ in Thousands
Apr. 30, 2017
Jul. 31, 2016
Apr. 30, 2016
Debt Instrument [Line Items]      
2017 (May 2017 through July 2017) $ 9,525    
2018 38,397    
2019 38,455    
2020 38,516    
2021 38,580    
Thereafter 1,047,411    
Total debt $ 1,210,884 $ 702,320 $ 629,178