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Long-Term Debt (Schedule Of Aggregate Maturities For Debt Outstanding) (Details) - USD ($)
$ in Thousands
Jan. 31, 2018
Jul. 31, 2017
Jan. 31, 2017
Debt Instrument [Line Items]      
2018 (February 2018 through July 2018) $ 19,069    
2019 38,455    
2020 38,516    
2021 38,580    
2022 603,023    
Thereafter 486,865    
Total debt $ 1,224,508 $ 1,276,521 $ 1,259,576