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Equities (Tables)
 12 Months Ended
Aug. 31, 2017
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, for the years ended August 31, 2017, 2016, and 2015 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, 2014, net of tax
$
(151,852
)
 
$
4,398

 
$
(2,722
)
 
$
(6,581
)
 
$
(156,757
)
Other comprehensive income (loss), before tax:
 
 
 
 
 
 
 
 
 
Amounts before reclassifications
(54,284
)
 
(396
)
 
(5,001
)
 
(30,672
)
 
(90,353
)
Amounts reclassified out
21,681

 
—

 
792

 
—

 
22,473

Total other comprehensive income (loss), before tax
(32,603
)
 
(396
)
 
(4,209
)
 
(30,672
)
 
(67,880
)
Tax effect
12,726

 
154

 
1,607

 
(4,057
)
 
10,430

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

 
(5,324
)
 
(41,310
)
 
(214,207
)
Other comprehensive income (loss), before tax:
 
 
 
 
 
 
 
 
 
Amounts before reclassifications
(10,512
)
 
2,447

 
(11,353
)
 
(1,036
)
 
(20,454
)
Amounts reclassified out
20,998

 
—

 
5,071

 
469

 
26,538

Total other comprehensive income (loss), before tax
10,486

 
2,447

 
(6,282
)
 
(567
)
 
6,084

Tax effect
(3,903
)
 
(947
)
 
2,410

 
(1,163
)
 
(3,603
)
Other comprehensive income (loss), net of tax
6,583

 
1,500

 
(3,872
)
 
(1,730
)
 
2,481

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

 
(9,196
)
 
(43,040
)
 
(211,726
)
Other comprehensive income (loss), before tax:
 
 
 
 
 
 
 
 
 
Amounts before reclassifications
25,216

 
7,117

 
1,892

 
(8,472
)
 
25,753

Amounts reclassified out
23,572

 
—

 
1,742

 
15

 
25,329

Total other comprehensive income (loss), before tax
48,788

 
7,117

 
3,634

 
(8,457
)
 
51,082

Tax effect
(18,688
)
 
(2,732
)
 
(1,392
)
 
(214
)
 
(23,026
)
Other comprehensive income (loss), net of tax
30,100

 
4,385

 
2,242

 
(8,671
)
 
28,056

Balance as of August 31, 2017, net of tax
$
(135,046
)
 
$
10,041

 
$
(6,954
)
 
$
(51,711
)
 
$
(183,670
)