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Equity (Details) - Common Class B [Member] - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Nov. 15, 2018 | May 31, 2018 | Apr. 16, 2018 | Oct. 31, 2018 | Oct. 31, 2017
Howard S. Jonas [Member] |  |  |  |  |
Equity (Textual) |  |  |  |  |
Aggregate purchase price |  | $ 1,500 | $ 15,000 |  |
Agreed to purchase shares of common stock |  |  | 2,546,689 |  |
Purchase price per share |  |  | $ 5.89 |  |
Purchase price reduced |  |  | $ 200 |  |
Remainder of purchase price |  |  | $ 13,300 |  |
Stock Repurchase Program [Member] |  |  |  |  |
Equity (Textual) |  |  |  |  |
Repurchase of aggregate shares |  |  |  | 8,000,000 |
Aggregate purchase price of shares repurchased |  |  |  | $ 3,900 |
Class B common stock shares repurchased |  |  |  | 729,110 |
Shares remained available for repurchase under the stock repurchase program |  |  |  | 6,900,000 |
Stock Repurchase Program [Member] | Employee [Member] |  |  |  |  |
Equity (Textual) |  |  |  |  |
Aggregate purchase price of shares repurchased |  |  |  |  | $ 23,000
Class B common stock shares repurchased |  |  |  | 0 | 1,668
2015 Stock Option and Incentive Plan [Member] | Subsequent Event [Member] |  |  |  |  |
Equity (Textual) |  |  |  |  |
Common stock available for grant of awards | 100,000 |  |  |  |

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