Stock Option Plans (Status For Options Which Contain Vesting Provisions) (Details)	12 Months Ended
	Jul. 31, 2015 $ / shares shares
Share-based Compensation [Abstract]
Options Non- vested at July 31, 2013	1,720,063
Options, Granted	1,003,750
Options, Vested	(870,930)
Options, Canceled	(95,743)
Options Non-vested at July 31, 2014	1,757,140
Weighted Average Grant Date Fair Value, Outstanding at July 31, 2013 | $ / shares	$ 10.35
Weighted Average Grant Date Fair Value, Granted | $ / shares	10.06
Weighted Average Grant Date Fair Value, Vested | $ / shares	10.02
Weighted Average Grant Date Fair Value, Canceled | $ / shares	10.21
Weighted Average Grant Date Fair Value, Outstanding at July 31, 2014 | $ / shares	$ 10.36