Equity (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended			6 Months Ended
	Jan. 06, 2020	Dec. 12, 2019	Apr. 16, 2019	Dec. 21, 2018	May 31, 2018	Jan. 31, 2020	Jan. 31, 2019	Apr. 16, 2018
Equity (Textual)
Proceeds from the exercise of stock options						$ 276
Aggregate purchase price							$ 13,272
Common Class B
Equity (Textual)
Repurchase of aggregate shares						8,000,000
Class B common stock shares repurchased							729,110
Aggregate purchase price of shares repurchased							$ 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 Class B | Deferred Stock Units [Member]
Equity (Textual)
Vesting for DSUs	38,024
Unvested DSUs outstanding						314,516
Common Class B | Employess [Member]
Equity (Textual)
Class B common stock shares repurchased						37,348	2,036
Aggregate purchase price of shares repurchased						$ 300	$ 16
Common Class B | 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 Class B | 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