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Income Taxes (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2013
Federal:      
Current $ 95,468 $ 90,207 $ 87,484
Deferred 5,841 (9,589) (1,073)
Federal Income Tax Expense (Benefit), Continuing Operations 101,309 80,618 86,411
State:      
Current 1,160 1,912 3,871
Deferred (86) (279) 66
State and Local Income Tax Expense (Benefit), Continuing Operations 1,074 1,633 3,937
Foreign:      
Current 11,062 10,077 9,090
Deferred (1,159) (980) (2,591)
Foreign Income Tax Expense (Benefit), Continuing Operations 9,903 9,097 6,499
Income tax expense (benefit), total $ 112,286 $ 91,348 $ 96,847