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Equities (Tables) | 12 Months Ended
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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 | )

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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