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Income Taxes (Details Textual) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 22, 2017
Oct. 31, 2016
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2016
Sep. 30, 2017
Income Taxes (Textual)            
Federal net operating loss carryforwards     $ 153,000      
Net operating loss carryforwards expiration date     2018      
Net operating losses expiration date     Jul. 31, 2038      
Foreign net operating losses     $ 143,000      
Foreign net operating loss, no expiration     117,000      
Foreign net operating loss, expiration in two to ten years     25,000      
Foreign net operating loss, expiration in twenty years     1,000      
Cumulative undistributed foreign earnings     $ 395,000      
Tax credits to be received           $ 21,100
Tax credit, description     The Company may claim a tax credit each tax year for ten years beginning in 2018. 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.      
(Provision for) benefit from income taxes   $ 16,600 $ (2,902) $ 2,021 $ (4,110)  
Income tax expense on deferred tax assets     16,017 $ 3,049  
U.S. federal statutory corporate tax rate     26.90%      
U.S. federal statutory tax rate, thereafter     21.00%      
Federal net operating loss carryforwards used to offset transition tax     $ 12,000      
Decrease in deferred tax assets     5,668 11,841    
Gross deferred tax assets revision     27,900      
Minimum [Member]            
Income Taxes (Textual)            
U.S. federal statutory corporate tax rate 21.00%          
Maximum [Member]            
Income Taxes (Textual)            
U.S. federal statutory corporate tax rate 35.00%          
Rafael Spin-Off [Member]            
Income Taxes (Textual)            
Decrease to deferred tax assets and valuation allowance     6,000      
Valuation Allowance [Member]            
Income Taxes (Textual)            
(Provision for) benefit from income taxes     3,300      
Noncurrent receivable     3,300      
US Deferred Tax Assets [Member]            
Income Taxes (Textual)            
Income tax expense on deferred tax assets       11,100    
Elmion Netherlands B.V. [Member]            
Income Taxes (Textual)            
(Provision for) benefit from income taxes       $ 16,600    
Net2phone [Member]            
Income Taxes (Textual)            
Net operating losses, federal     $ 77,000      
Net operating losses expiration, description     Expire through fiscal 2027.      
Losses limited under internal revenue code     $ 7,000