Note 13 - Employee Stock Option and Retirement Plans (Tables)

12 Months Ended

Aug. 31, 2013

Note 13 - Employee Stock Option and Retirement Plans (Tables) [Line Items]

Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity [Table Text Block]

	Number Outstanding			Weighted Average Exercise Price Per Share
Balance at August 31, 2010		6,451		$	47.73
Granted – non performance-based		91			89.45
Granted – performance-based		892			89.39
Granted – non-employee Directors grant		15			95.05
Exercised		(1,209	)		32.08
Forfeited		(108	)		66.55
Balance at August 31, 2011		6,132		$	57.28
Granted – non performance-based		540			93.96
Granted – performance-based		907			93.80
Granted – non-employee Directors grant		21			87.26
Exercised		(731	)		35.96
Forfeited		(786	)		87.37
Balance at August 31, 2012		6,083		$	64.76
Granted – non performance-based		645			92.22
Granted – performance-based		1,011			92.22
Granted – non-employee Directors grant		19			91.06
Exercised		(2,286	)		52.25
Forfeited		(743	)		93.84
Balance at August 31, 2013		4,729		$	75.95

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

					Outstanding						Exercisable
Range of Exercise Prices Per Share			Number Outstanding		Weighted Average Remaining Years of Contractual Life		Weighted Average Exercise Price Per Share		Aggregate Intrinsic Value		Number Exercisable		Weighted Average Exercise Price Per Share		Aggregate Intrinsic Value
$24.49	–	$59.36		782		1.4	$	39.96	$	48,801		759	$	40.03	$	47,293
$61.65	–	$65.67		661		2.5	$	64.44	$	25,046		379	$	65.44	$	13,992
$66.46	–	$67.41		696		3.1	$	66.47	$	24,975		495	$	66.47	$	17,749
$87.26	–	$91.06		551		8.4	$	90.08	$	6,761		142	$	88.74	$	1,935
$92.22	–	$92.55		1,591		9.2	$	92.22	$	16,111		-	$	92.22	$	-
$94.84	–	$103.30		448		8.0	$	95.28	$	3,167		150	$	94.92	$	1,113
Total Fiscal 2013				4,729		5.9	$	75.95	$	124,861		1,925	$	59.70	$	82,082

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

Prior Year Amounts	2012				2011
	Number of Shares		Weighted Average Exercise Price Per Share		Number of Shares		Weighted Average Exercise Price Per Share
Outstanding at fiscal year end		6,083	$	64.76		6,132	$	57.28
Exercisable at fiscal year end		2,858	$	48.44		2,643	$	38.99

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

	Number Outstanding			Weighted Average Grant Date Fair Value Per Award
Balance at August 31, 2010		261		$	61.65
Granted (restricted stock and stock units)		154		$	87.55
Vested		-		$	-
Canceled/forfeited		(8	)	$	69.41
Balance at August 31, 2011		407		$	71.31
Granted (restricted stock and stock units)		-		$	-
Vested*		(14	)	$	69.02
Canceled/forfeited		(10	)	$	77.13
Balance at August 31, 2012		383		$	71.34
Granted (restricted stock and stock units)		132		$	85.80
Vested**		(150	)	$	62.34
Canceled/forfeited		(7	)	$	81.38
Balance at August 31, 2013		358		$	80.43

Schedule of Share Based Awards Available For Grant [Table Text Block]

	Share-based Awards Available for Grant under Employee Stock Option Plans			Share-based Awards Available for Grant under Non-Employee Stock Option Plans
Balance at August 31, 2010		2,216			162
Amendment to the 2004 Stock Option and Award Plan to increase the number of shares available for issuance**		4,000			-
Granted – non performance-based options		(91	)		-
Granted – performance-based options		(892	)		-
Granted – non-employee Directors grant		-			(15	)
Restricted stock awards granted*		(386	)		-
Share-based awards canceled/forfeited		130			-
Balance at August 31, 2011		4,977			147
Granted – non performance-based options		(540	)		-
Granted – performance-based options		(907	)		-
Granted – non-employee Directors grant		-			(21	)
Restricted stock awards granted*		-			-
Share-based awards canceled/forfeited		810			-
Balance at August 31, 2012		4,340			126
Granted – non performance-based options		(645	)		-
Granted – performance-based options		(1,011	)		-
Granted – non-employee Directors grant		-			(19	)
Restricted stock awards granted*		(329	)		-
Share-based awards canceled/forfeited		761			-
Balance at August 31, 2013		3,116			107

Performance Shares [Member]

Note 13 - Employee Stock Option and Retirement Plans (Tables) [Line Items]

ScheduleOfShareBasedCompensationVestingPercentageAndRelatedExpensesTableTextBlock

Vesting Percentage	Total Unamortized Stock-based Compensation Expense at August 31, 2013		Cumulative Catch-up Adjustment*			Average Remaining Quarterly Expense to be Recognized
0%	$	0	$	(1,192	)	$	0
20%	$	3,556	$	0		$	213
60%	$	10,668	$	2,384		$	639
100%	$	17,780	$	4,768		$	1,065

July 2012 Performance Based [Member]

Note 13 - Employee Stock Option and Retirement Plans (Tables) [Line Items]

ScheduleOfShareBasedCompensationVestingPercentageAndRelatedExpensesTableTextBlock

Vesting Tranche	Cumulative Catch-up Adjustment**			Remaining Expense to be Recognized
First 20%*		n/a			n/a*
Second 20%	$	(361	)	$	0
Third 20%	$	448		$	2,391
Fourth 20%	$	848		$	3,591
Fifth 20%	$	1,358		$	4,681