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Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Statement Of Other Comprehensive Income [Abstract]    
Tax effects on unrealized gain (loss) on interest rate swaps $ (228) $ (164)
Tax effects on reclassification adjustment of interest rate swaps to net income $ 176 $ 208