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Earnings Per Share and Dividends (Dividends) (Details 2) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Quarter One [Member]    
Dividends Payable [Line Items]    
Dividend Declaration Date Oct. 20, 2016 Oct. 14, 2015
Dividend per Share $ 0.08 $ 0.08
Total of Cash Dividends Declared $ 15,248 $ 15,906
Date of Record for Dividend Payment Nov. 15, 2016 Nov. 16, 2015
Dividend Cash Payment Date Dec. 01, 2016 Dec. 01, 2015
Quarter Two [Member]    
Dividends Payable [Line Items]    
Dividend Declaration Date Jan. 26, 2017 Jan. 21, 2016
Dividend per Share $ 0.08 $ 0.08
Total of Cash Dividends Declared $ 15,051 $ 15,947
Date of Record for Dividend Payment Feb. 15, 2017 Feb. 16, 2016
Dividend Cash Payment Date Mar. 01, 2017 Mar. 01, 2016