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Line of Credit Facility - Additional Information (Detail) (USD $)
 12 Months Ended 0 Months Ended
Jul. 31, 2013
Minimum
Jul. 31, 2013
Maximum
Jul. 31, 2013
Amendment
Minimum
Jul. 31, 2013
Amendment
Maximum
Jan. 31, 2014
Line Of Credit Facility
Mar. 27, 2014
Amended and Restated Line
Subsequent Event
Mar. 27, 2014
Amended and Restated Line
Minimum
Subsequent Event
Mar. 27, 2014
Amended and Restated Line
Maximum
Subsequent Event
Line of Credit Facility [Line Items]                
Line of credit facility     $ 100,000,000 $ 175,000,000   $ 175,000,000    
Interest rate on cash advances in addition to LIBOR 0.50% 1.50%         0.50% 1.50%
Outstanding letters of credit and stand-by letters of credit         69,788,000      
Available credit including accordion feature         105,212,000      
Line of credit facility, period           5 years    
Additional line of credit borrowing, amount           $ 50,000,000