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Valuation and Qualifying Accounts and Reserves (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2011
Inventory Reserves [Member]
      
Balance at Beginning of Period $ 1,864 $ 1,552 $ 1,452
Charged to Costs and Expenses 2,203 1,914 2,389
Deductions (2,307) (1,602) (2,289)
Balance at End of Period 1,760 1,864 1,552
Valuation Allowance On Income Taxes [Member]
      
Balance at Beginning of Period 1,588 1,588 1,588
Charged to Costs and Expenses 1,474 0 0
Deductions   0 0
Balance at End of Period 3,062 1,588 1,588
Trade Receivable Allowances [Member]
      
Balance at Beginning of Period 4,553 3,423 2,259
Charged to Costs and Expenses 773 2,456 2,246
Deductions (4,848) (1,326) (1,082)
Balance at End of Period $ 478 $ 4,553 $ 3,423