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Equity (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended			9 Months Ended
	Jun. 05, 2019	Dec. 13, 2018	Dec. 21, 2018	May 31, 2018	Apr. 16, 2018	Apr. 30, 2019	Apr. 30, 2018
Equity (Textual)
Aggregate purchase price						$ 13,272
Subsequent Event [Member]
Equity (Textual)
Deferred stock units equity incentive program, number authorized	400,000
Deferred stock units equity incentive program, number granted	89,500
Deferred stock units equity incentive program, vesting dates	Jan. 06, 2020
Deferred stock units equity incentive program, vesting dates	Jan. 05, 2021
Deferred stock units equity incentive program, vesting dates	Jan. 05, 2022
Minimum [Member] | Subsequent Event [Member]
Equity (Textual)
Deferred stock units equity incentive program, vesting percentage	50.00%
Maximum [Member] | Subsequent Event [Member]
Equity (Textual)
Deferred stock units equity incentive program, vesting percentage	200.00%
Common Class B [Member] | Howard S. Jonas [Member]
Equity (Textual)
Aggregate purchase price			$ 14,800	$ 1,500
Agreed to purchase shares of common stock			2,546,689		2,546,689
Purchase price per share					$ 5.89
Purchase price reduced					$ 200
Stock Repurchase Program [Member] | Common Class B [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] | Common Class B [Member] | Employee [Member]
Equity (Textual)
Aggregate purchase price of shares repurchased						$ 28,000	$ 100
Class B common stock shares repurchased						3,748	5,170
2015 Stock Option and Incentive Plan [Member] | Common Class B [Member]
Equity (Textual)
Common stock available for grant of awards		100,000

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