Note 14. Employee Stock Option and Retirement Plans (Detail) - Changes to the Current Estimate of the Vesting Percentage and Related Expense (USD $) In Thousands, unless otherwise specified		12 Months Ended
	Jul. 31, 2011	Aug. 31, 2012 Zero Percent [Member] Other Performace-Based Options [Member]	Aug. 31, 2012 Fifty Percent [Member] Other Performace-Based Options [Member]	Aug. 31, 2012 One Hundred Percent [Member] Other Performace-Based Options [Member]
Vesting Percentage	25.00%	0.00%	50.00%	100.00%
Cumulative Catch-up Adjustment		$ 0	$ 3,380	$ 8,474
Remaining Expense to be Recognized		$ 0	$ 4,370	$ 7,026