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Earnings Per Share and Dividends (Dividends) (Details 2) - Quarter One [Member] - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Nov. 30, 2017
Nov. 30, 2016
Dividends Payable [Line Items]    
Dividend Declaration Date Oct. 19, 2017 Oct. 20, 2016
Dividend per Share $ 0.08 $ 0.08
Total of Cash Dividends Declared $ 14,588 $ 15,248
Date of Record for Dividend Payment Nov. 15, 2017 Nov. 15, 2016
Dividend Cash Payment Date Dec. 01, 2017 Dec. 01, 2016