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Accrued Expenses and Other Current Liabilities (Product Warranty Rollforward) (Details) (USD $)
 6 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Accrued Liabilities, Current [Abstract]    
Minimum coverage period of product warranty from the date of shipment 1 year  
Changes in Product Warranty Liability    
Accrued warranty obligations, as of the beginning of the period $ 7,797,000 $ 7,883,000
Provision for warranty obligations 3,548,000 3,709,000
Charges incurred (3,054,000) (2,928,000)
Accrued warranty obligations, as of the end of the period $ 8,291,000 $ 8,664,000