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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2015
Jan. 31, 2014
Statement Of Other Comprehensive Income [Abstract]        
Net income $ 52,193us-gaap_NetIncomeLoss $ 45,345us-gaap_NetIncomeLoss $ 104,808us-gaap_NetIncomeLoss $ 86,767us-gaap_NetIncomeLoss
Other comprehensive income:        
Unrealized gain on interest rate swaps, net (a) 545us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax [1] 591us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax [1] 949us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax [1] 892us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax [1]
Reclassification adjustment of interest rate swaps, net (b) (294)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax [2] (366)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax [2] (606)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax [2] (744)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax [2]
Foreign currency translation adjustments (22,840)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent 737us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent (46,808)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent 15,295us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
Total comprehensive income $ 29,604us-gaap_ComprehensiveIncomeNetOfTax $ 46,307us-gaap_ComprehensiveIncomeNetOfTax $ 58,343us-gaap_ComprehensiveIncomeNetOfTax $ 102,210us-gaap_ComprehensiveIncomeNetOfTax
[1] Net of tax effect of $(298) and $(331) for the three months ended January 31, 2015 and 2014, respectively. Net of tax effect of $(526) and $(495) for the six months ended January 31, 2015 and 2014, respectively.
[2] Net of tax effect of $157 and $204 for the three months ended January 31, 2015 and 2014, respectively. Net of tax effect of $332 and $412 for the six months ended January 31, 2015 and 2014, respectively.