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Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jan. 06, 2020 | Dec. 12, 2019 | Dec. 21, 2018 | May 31, 2018 | Apr. 16, 2018 | Apr. 30, 2020 | Apr. 30, 2019
Equity (Textual) |  |  |  |  |  |  |
Proceeds from the exercise of stock options |  |  |  |  |  | $ 276 |
Aggregate purchase price |  |  |  |  |  |  | $ 13,272
Common Stock Class B [Member] |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |
Repurchase of aggregate shares |  |  |  |  |  | 8,000,000 |
Class B common stock shares repurchased |  |  |  |  |  | 40,763 | 729,110
Aggregate purchase price of shares repurchased |  |  |  |  |  | $ 200 | $ 3,900
Shares remained available for repurchase under the stock repurchase program |  |  |  |  |  | 6,900,000 |
Class B common stock for vested shares | 100,284 |  |  |  |  |  |
Shares available for future grants |  |  |  |  |  | 600,000 |
Common Stock Class B [Member] | Howard S. Jonas [Member] |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |
Agreed to purchase shares of common stock |  |  | 2,546,689 |  | 2,546,689 |  |
Aggregate purchase price |  |  | $ 14,800 | $ 1,500 |  |  |
Class B common stock at a price per share |  |  |  |  | $ 5.89 |  |
Purchase price reduced |  |  |  |  | $ 200 |  |
Common Stock Class B [Member] | 2015 Stock Option and Incentive Plan [Member] |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |
Number of common stock available for grant of awards |  | 400,000 |  |  |  |  |
Proceeds from the exercise of stock options |  |  |  |  |  | $ 300 |
Proceeds from the exercise of stock options, shares |  |  |  |  |  | 32,551 |
Common Stock Class B [Member] | Deferred Stock Units [Member] |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |
Vesting for DSUs | 38,024 |  |  |  |  |  |
Unvested DSUs outstanding |  |  |  |  |  | 314,516 |
Common Stock Class B [Member] | Employess [Member] |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |
Class B common stock shares repurchased |  |  |  |  |  | 37,348 | 3,748
Aggregate purchase price of shares repurchased |  |  |  |  |  | $ 300 | $ 28

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