Note 13. Employee Stock Option and Retirement Plans (Detail) - Current Estimate of the Vesting Percentage and Related Expense (USD $) In Thousands, unless otherwise specified	Feb. 28, 2013
Cumulative Catch-up Adjustment	$ 49,100
July 2012 Performance Based Option Grant Review [Member] | Financial Performance Level One [Member]
Vesting Percentage	0.00%
Cumulative Catch-up Adjustment	(337)
July 2012 Performance Based Option Grant Review [Member] | Financial Performance Level Two [Member]
Vesting Percentage	20.00%
Remaining Expense to be Recognized	1,263
July 2012 Performance Based Option Grant Review [Member] | Financial Performance Level Three [Member]
Vesting Percentage	40.00%
Cumulative Catch-up Adjustment	206
Remaining Expense to be Recognized	2,657
July 2012 Performance Based Option Grant Review [Member] | Financial Performance Level Four [Member]
Vesting Percentage	60.00%
Cumulative Catch-up Adjustment	462
Remaining Expense to be Recognized	4,001
July 2012 Performance Based Option Grant Review [Member] | Financial Performance Level Five [Member]
Vesting Percentage	80.00%
Cumulative Catch-up Adjustment	691
Remaining Expense to be Recognized	5,372
July 2012 Performance Based Option Grant Review [Member] | Financial Performance Level Six [Member]
Vesting Percentage	100.00%
Cumulative Catch-up Adjustment	982
Remaining Expense to be Recognized	$ 6,681