NOTES PAYABLE Notes Payable (Details) (USD $)	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011
Debt Instrument
Notes Payable, current and noncurrent	$ 29,700,000	$ 33,300,000
Current maturities of notes payable	(3,800,000)	(3,600,000)
Notes payable, noncurrent	25,900,000	29,700,000
Prudential Insurance Company of America, Prudential Retirement Insurance and Annuity Company, Forethought Life Insurance Company, Physicians Mutual Insurance Company and BCBSM, Inc.
Debt Instrument
Notes Payable, current and noncurrent	18,500,000	18,500,000
Annual rate	3.96%
Final Payment Due	Aug. 01, 2020
Annual Principal Installments	3,083,000
Starting payments	8/1/2015
Ending payments	8/1/2020
Prudential Financial
Debt Instrument
Notes Payable, current and noncurrent	1,500,000	3,000,000
Annual rate	6.55%
Final Payment Due	Apr. 15, 2013
Annual Principal Installments	1,500,000
Minimum Overdue Financial Obligation Considered As Default	5,000,000
The Prudential Insurance Company of America and Prudential Retirement Insurance and Annuity Company
Debt Instrument
Notes Payable, current and noncurrent	9,700,000	11,800,000
Annual rate	5.89%
Final Payment Due	Oct. 15, 2015
Minimum Overdue Financial Obligation Considered As Default	5,000,000
Principal payment due October 15, 2012
Debt Instrument
Annual Principal Installments	2,300,000
Principal payment due October 15, 2013
Debt Instrument
Annual Principal Installments	3,500,000
Principal payment due October 15, 2014
Debt Instrument
Annual Principal Installments	3,500,000
Principal payment due October 15, 2015
Debt Instrument
Annual Principal Installments	$ 400,000