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Schedule of Components of Provision (Benefit) for Income Taxes from Continuing Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2011
Income Taxes Provision Benefit Summary Of Income Taxes [Line Items]      
Federal $ 74,610 $ 52,665 $ 43,787
State and local 4,187 4,250 (151)
Total current expense (benefit) 78,797 56,915 43,636
Federal (7,712) (2,888) (3,049)
State and local (789) (74) 103
Total deferred expense (benefit) (8,501) (2,962) (2,946)
Total income tax expense $ 70,296 $ 53,953 $ 40,690