Long-Term Debt (Schedule Of Aggregate Maturities For Debt Outstanding) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2016	Jan. 31, 2015	Jul. 31, 2015
Debt Instrument [Line Items]
Interest Expense, Debt	$ 10,900	$ 13,800	$ 21,500	$ 27,400
Amortization of Financing Costs	200	400	500	700
2013	6,537		6,537
2014	13,354		13,354
2015	13,397		13,397
2016	13,455		13,455
2017	268,641		268,641
Thereafter	380,151		380,151
Total debt	$ 695,535	$ 635,935	$ 695,535	$ 635,935	$ 816,830