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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parentheticals) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2011
Statement Of Other Comprehensive Income [Abstract]      
Tax effects on unrealized gain (loss) on interest rate swaps $ (1,647) $ 1,045 $ 0
Tax effects on reclassification adjustment of interest rate swaps to net income $ 874 $ 717 $ 0