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Share-Based Incentive Compansation Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
Share-based Incentive Compensation Plans by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 22.91      
Share-based incentive compensation $ 1,406 $ 9,166 $ 1,831 $ 10,473
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 4,300   $ 4,300  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years  
Restricted Stock [Member]        
Share-based Incentive Compensation Plans by Share-based Payment Award [Line Items]        
Share-based incentive compensation $ 842 [1] 2,369 $ 1,267 [1] 3,676
Performance Based Restricted Stock Awards [Member]        
Share-based Incentive Compensation Plans by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease) 334,920      
Time Based Restricted Stock Awards [Member]        
Share-based Incentive Compensation Plans by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease) 55,820      
Board of Directors Unrestricted Awards [Member]        
Share-based Incentive Compensation Plans by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease) 24,624      
Share-based incentive compensation $ 564 630 564 630
CEO Transition Awards [Member]        
Share-based Incentive Compensation Plans by Share-based Payment Award [Line Items]        
Share-based incentive compensation $ 0 $ 6,167 [2] $ 0 $ 6,167 [2]
2014 Equity Incentive Plan [Member]        
Share-based Incentive Compensation Plans by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 1,482,656   1,482,656  
2006 Incentive Plan [Member]        
Share-based Incentive Compensation Plans by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 917,395   917,395  
2010 Rewards Plan [Member]        
Share-based Incentive Compensation Plans by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 382,750   382,750  
[1] (1) The expense related to the performance based restricted stock awards for the three and six months ended February 29, 2016 reflects reduced attainment percentages.
[2] (2) CEO transition costs represent a charge for the modification and accelerated vesting upon retirement of the outstanding equity compensation awards granted to Joseph M. Gingo in 2013 and 2014.