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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parentheticals) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2014
Jan. 31, 2013
Statement Of Other Comprehensive Income [Abstract]        
Tax effects on unrealized gain (loss) on interest rate swaps $ (331) $ (534) $ (495) $ (924)
Tax effects on reclassification adjustment of interest rate swaps to net income $ 204 $ 226 $ 412 $ 460