Note 12 - Stockholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	May 31, 2014		Feb. 28, 2014	Nov. 30, 2013	May 31, 2014	May 31, 2013	Dec. 16, 2013	Aug. 31, 2013	Aug. 31, 2012
Note 12 - Stockholders' Equity (Details) [Line Items]
Preferred Stock, Shares Authorized	10,000,000				10,000,000	10,000,000		10,000,000
Preferred Stock, Par or Stated Value Per Share (in Dollars per share)	$ 0.01				$ 0.01	$ 0.01		$ 0.01
Preferred Stock, Shares Issued	0				0	0		0
Preferred Stock, Shares Outstanding	0				0	0
Common Stock, Shares Authorized	150,000,000				150,000,000			150,000,000
Common Stock, Par or Stated Value Per Share (in Dollars per share)	$ 0.01				$ 0.01			$ 0.01
Common Stock, Shares, Issued	48,713,635				48,713,635			48,110,740
Treasury Stock, Shares	6,697,423				6,697,423			4,786,330
Common Stock, Shares, Outstanding	42,016,212				42,016,212	44,038,000		43,324,410	44,279,000
Stock Repurchase Program, Authorized Amount (in Dollars)							$ 300
Stock Repurchased During Period, Shares					1,870,000	2,016,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount (in Dollars)	161.7				161.7
Shares Paid for Tax Withholding for Share Based Compensation					41,093
Payments Related to Tax Withholding for Share-based Compensation (in Dollars)					4.4
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	55,000	[1]	17,000	63,000
Restricted Stock [Member]
Note 12 - Stockholders' Equity (Details) [Line Items]
Shares Paid for Tax Withholding for Share Based Compensation					41,093	50,500
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	55,431				204,124	148,969
Share Repurchase Program [Member]
Note 12 - Stockholders' Equity (Details) [Line Items]
Stock Repurchased During Period, Shares					1,870,000
Stock Repurchased During Period, Value (in Dollars)					$ 200.7

[1] Of the total 55,431 restricted stock awards that vested during the third quarter of fiscal 2014, 29,087 related to awards granted on April 14, 2011 at the grant date price of $103.30. These restricted stock awards cliff vested 100% after three years on April 14, 2014. The awards were amortized to expense over the vesting period using the straight-line attribution method. The remaining 26,344 restricted stock awards that vested during the third quarter were granted on April 8, 2013 and cliff vest 20% annually upon each anniversary date of the grant.