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Share-based incentive compensation plans (Tables)
 12 Months Ended
Aug. 31, 2015
INCENTIVE STOCK PLANS [Abstract]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
The following table summarizes the activity of time-based and performance-based restricted stock awards: 
 
Awards Outstanding
 
Weighted-Average
Fair Market Value
(per share)
 
Time-
Based
 
Performance-
Based
 
Time-
Based
 
Performance-
Based
Outstanding at August 31, 2014
156,092

 
1,101,437

 
$
28.14

 
$
25.93

Granted
31,707

 
190,231

 
$
33.90

 
$
33.90

Vested
(90,869
)
 
(272,916
)
 
$
26.55

 
$
25.89

Forfeited
—

 
(442,795
)
 
$
—

 
$
21.77

Outstanding at August 31, 2015
96,930

 
575,957

 
$
31.51

 
$
31.78
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The fair values of the performance-based awards with market conditions were estimated using a Monte Carlo valuation model using the following assumptions: 
 
2015
 
2014
 
2013
Expected volatility
29.00
%
 
31.00
%
 
35.00
%
Risk-free interest rate
0.55
%
 
1.03
%
 
0.77
%
Correlation
38.00
%
 
53.00
%
 
56.00
%
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of stock option activity is as follows:
 
Outstanding Shares
Under Option
 
Weighted-Average
Exercise Price
Outstanding at August 31, 2014
4,834

 
$
19.29

Exercised
(3,167
)
 
$
19.34

Forfeited and expired
—

 
$
—

Outstanding at August 31, 2015
1,667

 
$
19.20

Exercisable at August 31, 2015
1,667

 
$
19.20
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
The following table summarizes the impact to the Company’s consolidated statements of operations from share-based incentive compensation plans, which is primarily included in selling, general and administrative expenses in the accompanying consolidated statements of operations: 
 
Year Ended August 31,
 
2015
 
2014
 
2013
 
(In thousands)
Time-based and performance-based restricted stock awards
$
4,071

 
$
7,105

 
$
2,454

Board of Directors unrestricted awards
631

 
797

 
850

CEO transition costs
6,167

 
—

 
—

Total share-based incentive compensation
$
10,869

 
$
7,902

 
$
3,304