Consolidated Statements of Changes in Shareholders' Equity and Comprehensive Income (USD $)	Class A [Member]	Class B [Member]	Capital in Excess of Par Value [Member]	Retained earnings [Member]	Accumulated Other Comprehensive Income (loss) [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]	Comprehensive Income [Member]	Total
Balance at Jul. 31, 2009	$ 26,776	$ 17,162	$ 20,093,952	$ 23,290,768	$ 441,965	$ (2,819,138)	$ 5,273,455	$ 6,517,228
Balance (in shares) at Jul. 31, 2009	2,677,651	1,716,074				307,091
Net income				4,257,607			2,299,060	6,556,667	6,556,667
Foreign currency translation adjustment					423,493		(59,236)	291,546
Cash dividends paid				(1,747,572)
Unrealized investment gain, net					23,159			23,159
Conversion of common stock - B to A	74	(74)
Conversion of common stock - B to A (in shares)	7,421	(7,421)
Issuance of stock under stock award plan			(372,172)			372,172
Issuance of stock under stock award plan (in shares)						(42,675)
Share-based compensation expense			485,945
Tax impact of share based compensation			102,737
Sale of subsidiary shares to noncontrolling interests							227,562
Distributions to noncontrolling interests							(845,106)
Purchase of additional noncontrolling interests			(254,181)		(72,711)	616,670	(2,526,094)	(72,711)
Purchase of additional noncontrolling interests (in shares)						(66,667)
Other			2,919			(25,170)
Other (in shares)						3,513
Balance at Jul. 31, 2010	26,850	17,088	20,059,200	25,800,803	815,906	(1,855,466)	4,369,641	6,798,661
Balance (in shares) at Jul. 31, 2010	2,685,072	1,708,653				201,262
Net income				6,960,263			1,163,673	8,123,936	8,123,936
Foreign currency translation adjustment					686,380		12,119	698,499
Cash dividends paid				(1,963,303)
Unrealized investment gain, net					(11,189)			(11,189)
Conversion of common stock - B to A	1	(1)
Conversion of common stock - B to A (in shares)	79	(79)
Repurchase of Class A common stock						(1,335,960)
Repurchase of Class A common stock (in shares)						84,002
Issuance of stock under stock award plan			(482,061)			482,061
Issuance of stock under stock award plan (in shares)						(55,041)
Share-based compensation expense			541,175
Sale of subsidiary shares to noncontrolling interests							90,368
Issuance of shares to noncontrolling interests							667,000
Distributions to noncontrolling interests							(847,749)
Purchase of additional noncontrolling interests			(135,285)		36,092	391,850	(1,531,623)	36,092
Purchase of additional noncontrolling interests (in shares)						(39,895)
Other (in shares)						396
Balance at Jul. 31, 2011	26,851	17,087	19,983,029	30,797,763	1,527,189	(2,317,515)	3,923,429	8,847,338	53,957,833
Balance (in shares) at Jul. 31, 2011	2,685,151	1,708,574				190,724
Net income				773,579			2,266,171	3,039,750	3,039,750
Foreign currency translation adjustment					(871,476)		124,455	(747,021)
Cash dividends paid				(2,036,559)
Unrealized investment gain, net					17,597			17,597
Repurchase of Class A common stock						(363,050)
Repurchase of Class A common stock (in shares)						22,825
Issuance of stock under stock award plan			(716,662)			716,662
Issuance of stock under stock award plan (in shares)						(62,099)
Share-based compensation expense			731,583
Tax impact of share based compensation			105,988
Sale of subsidiary shares to noncontrolling interests							41,634
Distributions to noncontrolling interests							(1,123,896)
Purchase of additional noncontrolling interests			(351,946)		38,532	66,871	(619,775)	38,532
Purchase of additional noncontrolling interests (in shares)						(5,208)
Other (in shares)						3,289
Balance at Jul. 31, 2012	$ 26,851	$ 17,087	$ 19,751,992	$ 29,534,783	$ 711,842	$ (1,897,032)	$ 4,612,018	$ 2,348,858	$ 52,757,541
Balance (in shares) at Jul. 31, 2012	2,685,151	1,708,574				149,531