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Share-Based Incentive Compansation Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
May 31, 2016
Feb. 29, 2016
May 31, 2015
May 31, 2016
May 31, 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 $ (151)   $ 1,590 $ 1,680 $ 12,063
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 3,000     $ 3,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       1 year 10 months  
Restricted Stock [Member]          
Share-based Incentive Compensation Plans by Share-based Payment Award [Line Items]          
Share-based incentive compensation (151) [1]   1,590 $ 1,116 [1] 5,266
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 0   0 564 630
CEO Transition Awards [Member]          
Share-based Incentive Compensation Plans by Share-based Payment Award [Line Items]          
Share-based incentive compensation $ 0   $ 0 $ 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 396,946     396,946  
[1] (1) The expense related to the performance-based restricted stock awards for the three and nine months ended May 31, 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.