Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Oct. 31, 2014	Jul. 31, 2014	Oct. 31, 2013
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 0.001	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000	5,000,000
Preferred stock, shares issued	0	0	0
Preferred stock, shares outstanding	0	0	0
Common stock, par value	$ 0.001	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000	100,000,000
Common stock, shares issued	31,854,719	31,824,701	22,875,396
Common stock, shares outstanding	31,382,026	31,380,758	22,475,274
Treasury stock, shares	472,693	443,943	400,122