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Stock-based Payment Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended
Jan. 31, 2015
Number of Options [Roll Forward]  
Outstanding as of July 31, 2014 19,082us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Grants of options 349us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Exercises (391)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Forfeitures or expirations (162)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
Outstanding as of January 31, 2015 18,878us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Exercisable as of January 31, 2015 13,763us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Weighted - Average Exercise Price [Roll Forward]  
Outstanding as of July 31, 2014 $ 21.64us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Grants of options $ 34.52us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Exercise Price $ 19.70us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Forfeitures or expirations $ 31.65us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
Outstanding as of January 31, 2015 $ 21.83us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Exercisable as of January 31, 2015 $ 17.28us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Weighted - Average Remaining Contractual Term [Roll Forward]  
Outstanding as of July 31, 2014 6 years 4 days
Outstanding as of January 31, 2015 5 years 7 months 21 days
Exercisable as of January 31, 2015 4 years 6 months 7 days
Aggregate Intrinsic Value [Roll Forward]  
Outstanding as of July 31, 2014 $ 235,734us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Outstanding as of January 31, 2015 278,799us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Exercisable as of January 31, 2015 $ 265,913us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1