Note 12 - Stockholders' Equity (Tables)

12 Months Ended

Aug. 31, 2013

Stockholders' Equity Note [Abstract]

DividendDeclarationAndPaymentDetailsTableTextBlock

Declaration Date	Dividends Per Share of Common Stock		Type	Record Date	Total $ Amount (in thousands)		Payment Date
August 15, 2013	$	0.35	Regular (cash)	August 31, 2013	$	15,164	September 17, 2013
May 14, 2013	$	0.35	Regular (cash)	May 31, 2013	$	15,413	June 18, 2013
February 21, 2013	$	0.31	Regular (cash)	February 28, 2013	$	13,510	March 19, 2013
November 15, 2012	$	0.31	Regular (cash)	November 30, 2012	$	13,746	December 18, 2012
August 8, 2012	$	0.31	Regular (cash)	August 31, 2012	$	13,727	September 18, 2012
May 8, 2012	$	0.31	Regular (cash)	May 31, 2012	$	13,893	June 19, 2012
February 14, 2012	$	0.27	Regular (cash)	February 29, 2012	$	12,085	March 20, 2012
November 10, 2011	$	0.27	Regular (cash)	November 30, 2011	$	12,181	December 20, 2011
August 11, 2011	$	0.27	Regular (cash)	August, 31 2011	$	12,165	September 20, 2011
May 9, 2011	$	0.27	Regular (cash)	May 31, 2011	$	12,374	June 21, 2011
February 9, 2011	$	0.23	Regular (cash)	February 28, 2011	$	10,612	March 15, 2011
November 10, 2010	$	0.23	Regular (cash)	November 30, 2010	$	10,660	December 21, 2010
August 10, 2010	$	0.23	Regular (cash)	August, 31 2010	$	10,586	September 21, 2010

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

	Aug 31, 2013			Aug 31, 2012
Accumulated unrealized loss on cash flow hedges, net of tax	$	(4,847	)	$	(1,551	)
Accumulated foreign currency translation adjustments		(26,326	)		(21,175	)
Total accumulated other comprehensive loss	$	(31,173	)	$	(22,726	)