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Credit Facility (Details) (USD $)
 3 Months Ended 9 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2012
Apr. 30, 2011
Credit Facility [Abstract]        
Line of credit facility, expiration date     Apr. 30, 2014  
Date the credit facility may be extended to     Dec. 31, 2016  
Line of credit facility, maximum borrowing capacity $ 100,000,000   $ 100,000,000  
Credit Facility sub-limit for commercial letters of credit 15,000,000   15,000,000  
Credit Facility sub-limit for standby letters of credit 35,000,000   35,000,000  
Minimum applicable interest rate margin over LIBOR at which the revolving credit facility may bear interest     1.75%  
Maximum applicable interest rate margin over LIBOR at which the revolving credit facility may bear interest     2.50%  
Percentage added to the Federal Funds Effective Rate to determine a base rate     0.50%  
Basis points added to the daily floating interest rate to determine a base rate     2.00%  
Minimum applicable interest rate margin over the base rate at which the credit facility may bear interest     0.75%  
Maximum applicable interest rate margin over the base rate at which the credit facility may bear interest     1.50%  
Minimum amount of total consolidated indebtedness, if maintained, that would not trigger a minimum level of Consolidated Adjusted EBITDA covenant requirement 200,000,000   200,000,000  
Outstanding standby letters of credit at period end 1,169,000   1,169,000  
Applicable interest rate margin over LIBOR at period end 2.75%   2.75%  
Applicable interest rate margin over base rate at period end 1.75%   1.75%  
Interest expense related to credit facility $ 256,000 $ 203,000 $ 707,000 $ 571,000