Long-Term Debt (Schedule Of Aggregate Maturities For Debt Outstanding) (Details) (USD $)	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Long-term Debt, Other Disclosures [Abstract]
2013	$ 990,000
2014	532,000
2015	535,000
2016	244,000
2017	257,000
Thereafter	488,207,000
Total debt	490,765,000	491,743,000
Gross interest expense	33,700,000	34,200,000	33,800,000
Amortization of deferred financing costs	1,900,000	1,700,000	1,600,000
Interest capitalized	$ 100,000	$ 600,000	$ 16,300,000