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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jul. 31, 2020 | Jul. 31, 2019
Income Taxes (Details) [Line Items] |  |
Cumulative undistributed foreign earnings | $ 376,000 |
Federal net operating loss carryforwards | 156,000 |
Foreign net operating losses | 90,000 |
Foreign net operating loss, no expiration | 81,000 |
Foreign net operating loss, expiration in two to ten years | 8,000 |
Foreign net operating loss, expiration in twenty years | 1,000 |
Additional valuation allowance | (15,470) | $ (1,850)
Tax credits to be received | $ 21,100 |
Tax credit, description | The Company may claim a portion of the tax credit each tax year for ten years beginning in 2017. The tax credit can be applied to 100% of the Company’s New Jersey tax liability each year, and the unused amount of the annual credit can be carried forward. In addition, the Company may apply for a tax credit transfer certificate to sell unused tax credits to another business. The tax credits must be sold for no less than 75% of the value of the tax credits. |
Valuation Allowance Utilized Current Expense [Member] |  |
Income Taxes (Details) [Line Items] |  |
Additional valuation allowance | $ 3,500 |
Valuation Allowance Utilized Future Expense [Member] |  |
Income Taxes (Details) [Line Items] |  |
Additional valuation allowance | 8,400 |
Net2phone [Member] |  |
Income Taxes (Details) [Line Items] |  |
Federal net operating loss carryforwards | $ 49,000 |
Net operating losses expiration, description | The Company’s subsidiary, net2phone, has additional federal net operating losses of approximately $49 million, which will expire through fiscal 2027. |
Losses limited under internal revenue code | $ 7,000 |

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