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Equities (Tables) | 12 Months Ended
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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 | )

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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=84228862&loc=SL7669686-108580 + Details
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