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Income Taxes Income Taxes (Tables)
9 Months Ended
May 31, 2018
Income Tax Disclosure [Abstract]  
Income Tax Effective Tax Rate [Table Text Block]
 
Three Months Ended May 31,
 
Nine Months Ended May 31,
 
2018
 
2017
 
2018
 
2017
Earnings before income taxes
$
25,017

 
$
18,482

 
$
33,465

 
$
25,724

Income tax (benefit) expense
(3,995
)
 
(4,029
)
 
17,448

 
(6,827
)
Effective income tax rate
(16.0
)%
 
(21.8
)%
 
52.1
%
 
(26.5
)%