Earnings per Share (Details 1) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Apr. 30, 2013		Apr. 30, 2012		Apr. 30, 2013	Apr. 30, 2012
Numerator:
Net income	$ (2,670)		$ 3,149		$ 3,278	$ 11,652
Non-cumulative dividends to preferred stockholders	0		0		0	1,574
Undistributed earnings allocated to preferred stockholders	0		0		0	3,674
Net income, basic	(2,670)		3,149		3,278	6,404
Adjustments to net income for dilutive options and restricted stock options	0		0		0	(390)
Net income, diluted	$ (2,670)		$ 3,149		$ 3,278	$ 6,794
Earnings Per Share:
Basic	$ (0.05)		$ 0.06		$ 0.06	$ 0.23
Diluted	$ (0.05)		$ 0.05		$ 0.05	$ 0.19
Weighted average shares used in computing net income per share:
Basic	57,017,856		52,519,909		55,887,786	28,351,997
Weighted average effect of dilutive stock options	0		5,310,277		3,659,929	4,168,638
Weighted average effect of dilutive restricted stock units	0		2,260,934		2,184,908	2,367,973
Weighted average effect of dilutive preferred stock warrants	0	[1]	36,310	[1]	0	39,821
Diluted (in shares)	57,017,856		60,127,430		61,732,623	34,928,429

[1] Series C convertible preferred stock warrants were automatically converted to equivalent common stock warrants upon the Company’s IPO on January 24, 2012 and were converted to shares of common stock or cancelled as of April 30, 2012.