Quarterly report pursuant to Section 13 or 15(d)

Capital Stock and Share Repurchase Share Repurchase (Details)

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Capital Stock and Share Repurchase Share Repurchase (Details) - shares
May 31, 2016
Aug. 31, 2015
Mar. 16, 2015
Oct. 01, 2014
Mar. 19, 2014
Sep. 28, 2011
Equity [Abstract]            
Stock Repurchase Program, Number of Shares Authorized to be Repurchased     7,000,000 7,000,000 7,000,000 7,000,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased 7,673,521          
Treasury Stock, Shares 20,326,479 19,726,479