Note 13 - Stockholders' Equity (Details) (USD $)	12 Months Ended							12 Months Ended			14 Months Ended	12 Months Ended
	Aug. 31, 2014		Aug. 31, 2013		Aug. 31, 2012	Dec. 16, 2013	Aug. 31, 2011	Aug. 31, 2014 Restricted Stock [Member] Previously Granted Awards [Member]	Aug. 31, 2014 Restricted Stock [Member]	Aug. 31, 2013 Restricted Stock [Member]	Jul. 31, 2011 Restricted Stock [Member]	Aug. 31, 2014 Share Repurchase Program [Member]	Aug. 31, 2013 Share Repurchase Program [Member]
Note 13 - Stockholders' Equity (Details) [Line Items]
Preferred Stock, Shares Authorized	10,000,000		10,000,000
Preferred Stock, Par or Stated Value Per Share (in Dollars per share)	$ 0.01		$ 0.01
Preferred Stock, Shares Issued	0		0
Preferred Stock, Shares Outstanding	0		0
Common Stock, Shares Authorized	150,000,000		150,000,000
Common Stock, Par or Stated Value Per Share (in Dollars per share)	$ 0.01		$ 0.01
Common Stock, Shares, Issued	49,110,218		48,110,740
Treasury Stock, Shares	7,317,416		4,786,330
Common Stock, Shares, Outstanding	41,792,802		43,324,410		44,279,000		45,055,000
Stock Repurchase Program, Authorized Amount (in Dollars)						$ 300,000,000
Treasury Stock, Shares, Acquired												2,489,993	3,400,000
Treasury Stock, Value, Acquired, Cost Method (in Dollars)	275,415,000		327,454,000		152,933,000							275,400,000	327,300,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount (in Dollars)	87,000,000
Shares Paid for Tax Withholding for Share Based Compensation	41,093		50,828						41,093	50,828
Payments Related to Tax Withholding for Share-based Compensation (in Dollars)	$ 4,400,000		$ 4,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	135,205	[1]	150,000	[2]	14,258			135,205		149,741	6,411

[1] The 135,205 restricted stock awards that vested during fiscal 2014 were comprised of: 62,544 of awards granted on November 8, 2010, which cliff vested 60% after three years (on November 8, 2013) with the remaining 40% cliff vesting after five years (on November 8, 2015) 29,087 of awards granted on April 14, 2011, which vested 100% after three years on April 14, 2014 26,344 restricted stock awards that were granted on April 8, 2013, which cliff vest 20% annually upon the anniversary date of the grant and 17,230 awards relating to restricted stock granted on February 9, 2010 which cliff vested 50% after four years (on February 9, 2014) and the remaining 50% vesting after six years on February 9, 2016.

[2] Of the total 149,741 restricted stock awards that vested during fiscal 2013, 87,758 related to awards granted on October 23, 2009. These restricted stock awards cliff vested 60% after three years (on October 23, 2012) and the remaining 40% will vest after five years (on October 23, 2014). An additional 55,572 awards that vested in fiscal 2013 related to awards granted on February 9, 2010 which cliff vested 100% after three years (on February 9, 2013). The remaining 6,411 restricted stock awards that vested were previously granted between June 2010 and July 2011 and vesting occurred when certain ASV targets were met in fiscal 2013.