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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

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