Note 13. Employee Stock Option and Retirement Plans (Detail) - Change in the Actual Financial Performance Level (USD $)	3 Months Ended
	Nov. 30, 2011
Total Unamortized Stock-based Compensation Expense	$ 53,800,000
November 2010 Annual Employee Performance-based Option Grant Review [Member] | Financial Performance Level One [Member]
Vesting Percentage (in Dollars)	0.00
Total Unamortized Stock-based Compensation Expense	0
One-time Adjustment	(988,000)
Average Remaining Quarterly Expense to be Recognized	0
November 2010 Annual Employee Performance-based Option Grant Review [Member] | Financial Performance Level Two [Member]
Vesting Percentage (in Dollars)	0.20
Total Unamortized Stock-based Compensation Expense	2,040,000
One-time Adjustment	0
Average Remaining Quarterly Expense to be Recognized	130,000
November 2010 Annual Employee Performance-based Option Grant Review [Member] | Financial Performance Level Three [Member]
Vesting Percentage (in Dollars)	0.60
Total Unamortized Stock-based Compensation Expense	6,120,000
One-time Adjustment	1,976,000
Average Remaining Quarterly Expense to be Recognized	390,000
November 2010 Annual Employee Performance-based Option Grant Review [Member] | Financial Performance Level Four [Member]
Vesting Percentage (in Dollars)	1.00
Total Unamortized Stock-based Compensation Expense	10,200,000
One-time Adjustment	3,952,000
Average Remaining Quarterly Expense to be Recognized	650,000
November 2011 Annual Employee Performance-based Option Grant Review [Member] | Financial Performance Level One [Member]
Vesting Percentage (in Dollars)	0.00
Total Unamortized Stock-based Compensation Expense	0
One-time Adjustment	(91,000)
Average Remaining Quarterly Expense to be Recognized	0
November 2011 Annual Employee Performance-based Option Grant Review [Member] | Financial Performance Level Two [Member]
Vesting Percentage (in Dollars)	0.20
Total Unamortized Stock-based Compensation Expense	3,549,000
One-time Adjustment	0
Average Remaining Quarterly Expense to be Recognized	180,000
November 2011 Annual Employee Performance-based Option Grant Review [Member] | Financial Performance Level Three [Member]
Vesting Percentage (in Dollars)	0.60
Total Unamortized Stock-based Compensation Expense	10,647,000
One-time Adjustment	182,000
Average Remaining Quarterly Expense to be Recognized	540,000
November 2011 Annual Employee Performance-based Option Grant Review [Member] | Financial Performance Level Four [Member]
Vesting Percentage (in Dollars)	1.00
Total Unamortized Stock-based Compensation Expense	17,745,000
One-time Adjustment	364,000
Average Remaining Quarterly Expense to be Recognized	$ 900,000