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Summary of Significant Accounting Policies (Details Textuals) $ in Thousands | 12 Months Ended |
--- | --- | ---
Jul. 31, 2018 USD ($) Derivative | Jul. 31, 2018 Derivative | Jul. 31, 2018 customer Derivative | Jul. 31, 2018 Derivative Segment | Jul. 31, 2017 USD ($) customer Derivative | Jul. 31, 2016 USD ($) customer Derivative | Aug. 01, 2018 USD ($)
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense | $ 21,300 |  |  |  | $ 107,600 | $ 14,700 |
Business Acquisition, Percentage of Voting Interests Acquired | 59.50% | 59.50% | 59.50% | 59.50% |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 40.50% | 40.50% | 40.50% | 40.50% |  |  |
Proceeds from sale of majority-owned subsidiary | $ 1,796 |  |  |  | 0 | 0 |
Deconsolidation, Gain (Loss), Amount | 900 |  |  |  |  |  |
Abnormal Costs | 68,600 |  |  |  |  |  |
Advertising expenses | 5,900 |  |  |  | 5,600 | 6,800 |
Available-for-sale Securities, Amortized Cost Basis |  |  |  |  |  | 21,100 |
Proceeds from Sale of Debt Securities, Available-for-sale |  |  |  |  |  | 21,500 |
Available-for-sale Securities, Gross Realized Gains |  |  |  |  |  | 400 |
Number of operating segments |  | 2 |  | 2 |  |  |
Number of reportable segment |  | 2 |  | 2 |  |  |
Capitalized Computer Software, Period Increase (Decrease) | $ 15,500 |  |  |  |  | $ 29,800 |
Capitalized Computer Software, Impairments |  |  |  |  | $ 19,400 |  |
Number of interest rate derivatives held | Derivative | 0 | 0 | 0 | 0 | 0 | 2 |
Proceeds from stock options exercised | $ 44,459 |  |  |  | $ 31,188 | $ 13,240 |
Minimum |  |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  |  | $ 10,000
Maximum |  |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  |  | $ 15,000
Sales Revenue, Net [Member] |  |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |
Number of Customers Exceeding Threshold | customer |  |  | 0 |  | 0 | 0 |

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