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Long-Term Debt (Schedule Of Aggregate Maturities For Debt Outstanding) (Details) - USD ($)
$ in Thousands
Oct. 31, 2017
Jul. 31, 2017
Oct. 31, 2016
Debt Instrument [Line Items]      
2018 (November 2017 through July 2018) $ 28,599    
2019 38,455    
2020 38,516    
2021 38,580    
2022 772,648    
Thereafter 387,862    
Total debt $ 1,304,660 $ 1,276,521 $ 1,414,816