Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member] Common Class A [Member]	Common Stock [Member] Common Class B [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Noncontrolling Interest [Member]
BALANCE at Jul. 31, 2019	$ 53,557	$ 33	$ 258	$ 273,313	$ (51,739)	$ (4,858)	$ (160,763)	$ (2,687)
BALANCE, SHARES at Jul. 31, 2019		3,272	25,803
Exercise of stock options	276			276
Exercise of stock options, shares			33
Repurchases of Class B common stock through repurchase program	(4,201)				(4,201)
Restricted Class B common stock purchased from employees	(281)				(281)
Stock-based compensation	3,856		$ 2	3,854
Stock-based compensation, shares			125
Distributions to noncontrolling interests	(934)							(934)
Other comprehensive loss	(2,552)					(2,552)
Net income	21,418						21,430	(12)
BALANCE at Jul. 31, 2020	71,139	$ 33	$ 260	277,443	(56,221)	(7,410)	(139,333)	(3,633)
BALANCE, SHARES at Jul. 31, 2020		3,272	25,961
Exercise of stock options	687		$ 1	686
Exercise of stock options, shares			81
Repurchases of Class B common stock through repurchase program	(2,849)				(2,849)
Restricted Class B common stock purchased from employees	(1,343)				(1,343)
Stock-based compensation	1,490		$ 3	1,487
Stock-based compensation, shares			301
Distributions to noncontrolling interests	(848)							(848)
Other comprehensive loss	(2,773)					(2,773)
Net income	96,891						96,475	416
Stock issued for matching contributions to the 401(k) Plan	1,042			1,042
Stock issued for matching contributions to the 401(k) Plan, shares			36
Grant of restricted equity in subsidiary				(2,361)				2,361
Business acquisition	669			(276)				945
Acquisition of interest in variable interest entity	2,509							2,509
BALANCE at Jul. 31, 2021	166,614	$ 33	$ 264	278,021	(60,413)	(10,183)	(42,858)	1,750
BALANCE, SHARES at Jul. 31, 2021		3,272	26,379
Exercise of stock options	$ 137			137
Exercise of stock options, shares	1,010		10
Repurchases of Class B common stock through repurchase program	$ (13,390)				(13,390)
Restricted Class B common stock purchased from employees	(8,974)				(8,974)
Stock-based compensation	1,930		$ 3	1,927
Stock-based compensation, shares			308
Other comprehensive loss	(1,122)					(1,122)
Net income	28,814						27,028	1,786
Exercise of stock options by Howard S. Jonas	(3,858)		$ 10	14,920	(18,788)
Exercise of stock options by Howard S. Jonas, shares			1,000
Business acquisition	1,000			1,000
Business acquisition, shares			28
Distributions to noncontrolling interests	(514)							(514)
BALANCE at Jul. 31, 2022	$ 170,637	$ 33	$ 277	$ 296,005	$ (101,565)	$ (11,305)	$ (15,830)	$ 3,022
BALANCE, SHARES at Jul. 31, 2022		3,272	27,725