Accrued Expenses and Other Current Liabilities (Details) (USD $)	Oct. 31, 2013	Jul. 31, 2013	Oct. 31, 2012	Jul. 31, 2012
Accrued Liabilities, Current [Abstract]
Accrued wages and benefits	$ 8,092,000	$ 11,526,000
Accrued warranty obligations	7,935,000	7,797,000	8,510,000	7,883,000
Accrued commissions and royalties	4,324,000	4,206,000
Accrued business acquisition payments	43,000	288,000
Other	5,789,000	6,075,000
Accrued expenses and other current liabilities	$ 26,183,000	$ 29,892,000