Consolidated Statements of Changes in Shareholders' Equity and Comprehensive Income (USD $)	12 Months Ended		12 Months Ended		3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Jul. 31, 2011 Class A [Member]	Oct. 29, 2011 Class A [Member]	Jul. 31, 2011 Class B [Member]	Oct. 29, 2011 Class B [Member]	Oct. 29, 2011 Capital in Excess of Par Value [Member]	Jul. 31, 2011 Capital in Excess of Par Value [Member]	Oct. 29, 2011 Retained earnings [Member]	Jul. 31, 2011 Retained earnings [Member]	Oct. 29, 2011 Accumulated Other Comprehensive Income (loss) [Member]	Jul. 31, 2011 Accumulated Other Comprehensive Income (loss) [Member]	Oct. 29, 2011 Treasury Stock [Member]	Jul. 31, 2011 Treasury Stock [Member]	Oct. 29, 2011 Noncontrolling Interest [Member]	Jul. 31, 2011 Noncontrolling Interest [Member]	Oct. 29, 2011 Comprehensive Income [Member]	Jul. 31, 2011 Comprehensive Income [Member]
Balance	$ 26,850	$ 26,851	$ 17,088	$ 17,087	$ 19,983,029	$ 20,059,200	$ 30,797,763	$ 25,800,803	$ 1,527,189	$ 815,906	$ (2,317,515)	$ (1,855,466)	$ 3,923,429	$ 4,369,641	$ 8,847,338	$ 6,798,661
Balance (in shares)	2,685,072	2,685,151	1,708,653	1,708,574							190,724	201,262
Net income							1,159,777	6,960,263					245,490	1,163,673	1,405,267	8,123,936
Foreign currency translation adjustment									(188,730)	686,380			147	12,119	(188,583)	698,499
Cash dividends paid								(1,963,303)
Unrealized investment gain, net									(222)	(11,189)					(222)	(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											(363,050)	(1,335,960)
Repurchase of Class A common stock (in shares)											22,825	84,002
Issuance of stock under stock award plan					(716,662)	(482,061)					716,662	482,061
Issuance of stock under stock award plan (in shares)											(62,099)	(55,041)
Share-based compensation expense					182,896	541,175
Tax impact of share based compensation					105,988
Sale of subsidiary shares to noncontrolling interests													41,634	90,368
Issuance of shares to noncontrolling interests														667,000
Distributions to noncontrolling interests													(110,754)	(847,749)
Purchase of additional noncontrolling interests					9,709	(135,285)			2,289	36,092		391,850	(73,748)	(1,531,623)	2,289	36,092
Purchase of additional noncontrolling interests (in shares)												(39,895)
Balance	$ 26,851	$ 26,851	$ 17,087	$ 17,087	$ 19,564,960	$ 19,983,029	$ 31,957,540	$ 30,797,763	$ 1,340,526	$ 1,527,189	$ (1,963,903)	$ (2,317,515)	$ 4,026,198	$ 3,923,429	$ 1,218,751	$ 8,847,338
Balance (in shares)	2,685,151	2,685,151	1,708,574	1,708,574							152,996	190,724
Other (in shares)											1,546	396