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Selected Quarterly Financial Data (Unaudited) (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jul. 31, 2017
Apr. 29, 2017
Jan. 31, 2017
Oct. 31, 2016
Jul. 31, 2016
Apr. 30, 2016
Jan. 31, 2016
Oct. 31, 2015
Jul. 31, 2015
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2015
Selected Quarterly Financial Data (Unaudited) (Textual)                        
Severance expense         $ 6,300       $ 200 $ 6,510 $ 8,363
Gain on sale of interest in Fabrix Systems, Ltd.           $ 1,100       1,086 76,864
Gain on sale of member interest in Visa Europe Ltd.         7,500         (63) 7,476  
Loss from operations expense $ 3,737 [1] $ (6,502) [2] $ 3,128 $ 5,186 [3] $ 6,225 [4] $ 5,676 [5] $ 6,377 $ 7,925   5,549 26,203 93,050
Benefit from income taxes       $ 16,600           (2,021) 4,110 6,088
Corporate -loss related to legal settlement and mutual release                   (10,436)
Income tax expense on deferred tax assets $ 11,100                 $ 16,017 $ 3,049 3,418
Straight Path [Member]                        
Selected Quarterly Financial Data (Unaudited) (Textual)                        
Corporate -loss related to legal settlement and mutual release   $ 10,100                   $ 0
[1] Included in net loss was income tax expense of $11.1 million from an increase in the valuation allowance on deferred tax assets.
[2] Included in loss from operations was expense of $10.1 million related to a legal settlement and mutual release, including legal fees incurred in the quarter.
[3] Included in net income was a benefit from income taxes of $16.6 million from the full recognition of certain deferred tax assets.
[4] Included in income from operations was severance expense of $6.3 million and gain on sale of member interest in Visa Europe Ltd. of $7.5 million.
[5] Included in income from operations was gain on sale of interest in Fabrix Systems Ltd. of $1.1 million.