Income Taxes (Provision for Income Taxes) (Details) (USD $)	12 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2009
Income Taxes [Abstract]
Federal - current	$ 29,735,000	$ 39,448,000	$ 26,487,000
Federal - deferred	683,000	(7,180,000)	(1,881,000)
State and local - current	3,683,000	5,448,000	1,513,000
State and local - deferred	62,000	(651,000)	(170,000)
Foreign - current	(270,000)	(406,000)	(227,000)
Foreign - deferred	16,000	13,000	22,000
Total provision for income taxes	$ 33,909,000	$ 36,672,000	$ 25,744,000