Summary of Selected Quarterly Financial Data (unaudited) (Details) - Quarterly Financial Data - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Quarterly Financial Data [Abstract]
Total revenues	$ 26,603	$ 26,433	$ 24,560	$ 25,177	$ 25,697	$ 23,986	$ 23,092	$ 24,824
Gross profit	12,085	11,445	10,819	11,234	11,317	10,483	10,028	10,999
Income (loss) before income taxes	37,068	(2,113)	7,039	4,521	8,523	(3,003)	(4,206)	(3,606)	$ 46,515	$ (2,292)	$ (9,905)
Net income (loss)	$ 36,135	$ (2,115)	$ 6,832	$ 4,434	$ 8,442	$ (2,907)	$ (4,091)	$ (3,729)	$ 45,286	$ (2,285)	$ (9,977)
Basic and diluted (loss) income per common share (in Dollars per share)					$ 0.18	$ (0.06)	$ (0.09)	$ (0.08)
Basic income (loss) per common share (in Dollars per share)	$ 0.78	$ (0.05)	$ 0.15	$ 0.10					$ 0.98	$ (0.05)	$ (0.23)
Diluted income (loss) per common share (in Dollars per share)	$ 0.77	$ (0.05)	$ 0.15	$ 0.10					$ 0.97	$ (0.05)	$ (0.23)