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Income Taxes (Details Textuals) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Jan. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2017
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |
Tax Credit Carryforward, Amount |  |  | $ 3,800 | $ 8,200 | $ 3,800 |
Other Tax Expense Benefit Transition Tax Net of Foreign Tax Credit |  | $ 1,100 | 12,400 |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  | 4,300 |  |  |
Valuation allowance |  |  | 4,592 | 8,578 | 4,592 |
Unrecognized tax benefits that would impact effective tax rate |  |  | 16,000 | 22,000 | 16,000 |
Interest and penalties related to income tax |  |  | $ 6,000 | 7,600 | $ 6,000 | $ 5,300
Undistributed Earnings of Foreign Subsidiaries |  |  |  | $ 165,000 |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 35.00% |  |  | 21.00% | 26.90% | 35.00%
Effective Income Tax Rate Reconciliation, Percent |  |  |  | 16.10% | 25.70% | 10.40%
Share-based Payment Arrangement, Expense, Tax Benefit |  |  |  | $ 46,100 | $ 21,300 | $ 107,600

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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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