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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, 2013
Jan. 31, 2012
Jan. 31, 2013
Jan. 31, 2012
Statement Of Other Comprehensive Income [Abstract]        
Tax effects on Interest rate swap $ 308 $ (684) $ 464 $ (684)