Accrued Expenses and Other Current Liabilities (Details) - USD ($)	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Accrued Liabilities, Current [Abstract]
Accrued wages and benefits	$ 12,134,000	$ 12,410,000
Accrued warranty obligations	8,638,000	8,618,000	$ 7,797,000
Accrued commissions and royalties	2,398,000	3,215,000
Other	6,300,000	5,560,000
Accrued expenses and other current liabilities	$ 29,470,000	$ 29,803,000