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Schedule of Change in Retained Earnings (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2015
Apr. 30, 2014
Retained Earnings Adjustments [Line Items]        
Beginning Balance     $ 1,030,428us-gaap_RetainedEarningsAccumulatedDeficit  
Net income 62,845us-gaap_NetIncomeLoss 55,122us-gaap_NetIncomeLoss 130,418us-gaap_NetIncomeLoss 112,422us-gaap_NetIncomeLoss
Dividends declared and paid     (43,237)us-gaap_DividendsCommonStockCash  
Ending Balance $ 1,117,609us-gaap_RetainedEarningsAccumulatedDeficit   $ 1,117,609us-gaap_RetainedEarningsAccumulatedDeficit