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Income Taxes (Details Textuals) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2018 | Dec. 31, 2017 | Jul. 31, 2018 | Jan. 31, 2018 | Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |
Foreign Earnings Repatriated |  |  |  |  | $ 93,900 |  |
Tax Credit Carryforward, Amount | $ 3,800 |  | $ 3,800 |  | 3,800 | $ 5,500 |
Effective Income Tax Rate Reconciliation, Tax Credit, Percent | 50.00% |  |  |  |  |  |
Other Tax Expense Benefit Transition Tax Net of Foreign Tax Credit |  |  | 12,400 | $ 10,600 |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  | 4,300 | $ 600 |  |  |
Valuation allowance | $ 4,592 |  | 4,592 |  | 4,592 | 6,455 |
Unrecognized tax benefits that would impact effective tax rate | 16,000 |  | 16,000 |  | 16,000 | 13,000 |
Interest and penalties related to income tax | $ 6,000 |  | 6,000 |  | $ 6,000 | $ 5,300 | $ 4,900
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 35.00% |  |  | 26.90% | 35.00% | 35.00%
Effective Income Tax Rate Reconciliation, Percent |  |  |  |  | 25.70% | 10.40% | 31.70%
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |  |  |  |  | $ 21,300 | $ 107,600 | $ 14,700
Undistributed Earnings of Foreign Subsidiaries | $ 160,000 |  | $ 160,000 |  | $ 160,000 |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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