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Accrued Expenses and Other Current Liabilities (Details) (USD $)
Jan. 31, 2014
Jul. 31, 2013
Jan. 31, 2013
Jul. 31, 2012
Accrued Liabilities, Current [Abstract]        
Accrued wages and benefits $ 9,783,000 $ 11,526,000    
Accrued warranty obligations 8,291,000 7,797,000 8,664,000 7,883,000
Accrued commissions and royalties 2,985,000 4,206,000    
Accrued business acquisition payments 0 288,000    
Other 4,867,000 6,075,000    
Accrued expenses and other current liabilities $ 25,926,000 $ 29,892,000