Income Taxes (Provision for Income Taxes) (Details) - USD ($)	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Income Tax Disclosure [Abstract]
Federal - current	$ 367,000	$ (441,000)	$ 2,297,000
Federal - deferred	(7,499,000)	8,399,000	(2,930,000)
State and local - current	440,000	608,000	408,000
State and local - deferred	1,115,000	659,000	(310,000)
Foreign - current	429,000	413,000	81,000
Foreign - deferred	5,000	16,000	0
(Benefit from) provision for income taxes	$ (5,143,000)	$ 9,654,000	$ (454,000)