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Equities (Tables)
 12 Months Ended
Aug. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Changes in accumulated other comprehensive income (loss) by component, net of tax, for the years ended August 31, 2016, 2015 and 2014 are as follows:
 
Pension and Other Postretirement Benefits
 
Unrealized Net Gain (Loss) on Available for Sale Investments
 
Cash Flow Hedges
 
Foreign Currency Translation Adjustment
 
Total
 
(Dollars in thousands)
Balance as of August 31, 2013
$
(165,611
)
 
$
2,370

 
$
11,685

 
$
(5,311
)
 
$
(156,867
)
Current period other comprehensive income (loss), net of tax
(90
)
 
2,028

 
(6,011
)
 
(1,957
)
 
(6,030
)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax
13,849

 
—

 
(8,396
)
 
687

 
6,140

Net other comprehensive income (loss), net of tax
13,759

 
2,028

 
(14,407
)
 
(1,270
)
 
110

Balance as of August 31, 2014
(151,852
)
 
4,398

 
(2,722
)
 
(6,581
)
 
(156,757
)
Current period other comprehensive income (loss), net of tax
(33,238
)
 
(242
)
 
(3,394
)
 
(34,729
)
 
(71,603
)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax
13,361

 
—

 
792

 
—

 
14,153

Net other comprehensive income (loss), net of tax
(19,877
)
 
(242
)
 
(2,602
)
 
(34,729
)
 
(57,450
)
Balance as of August 31, 2015
(171,729
)
 
4,156

 
(5,324
)
 
(41,310
)
 
(214,207
)
Current period other comprehensive income (loss), net of tax
(6,330
)
 
1,500

 
(6,999
)
 
(2,200
)
 
(14,029
)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax
12,913

 
—

 
3,127

 
470

 
16,510

Net other comprehensive income (loss), net of tax
6,583

 
1,500

 
(3,872
)
 
(1,730
)
 
2,481

Balance as of August 31, 2016
$
(165,146
)
 
$
5,656

 
$
(9,196
)
 
$
(43,040
)
 
$
(211,726
)