Accrued Expenses and Other Current Liabilities (Details) - USD ($)	Oct. 31, 2015	Jul. 31, 2015	Oct. 31, 2014	Jul. 31, 2014
Accrued Liabilities, Current [Abstract]
Accrued wages and benefits	$ 8,161,000	$ 12,134,000
Accrued warranty obligations	8,702,000	8,638,000	$ 8,718,000	$ 8,618,000
Accrued commissions and royalties	1,976,000	2,398,000
Other	7,195,000	6,300,000
Accrued expenses and other current liabilities	$ 26,034,000	$ 29,470,000