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Benefit Plans Schedule of Net Benefit Costs (Tables) | 3 Months Ended
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Nov. 30, 2012
Schedule of Net Periodic Benefit Costs [Abstract] |
Schedule of Net Benefit Costs of Assumptions Used [Table Text Block] |
| Qualified Pension Benefits |  | Non-Qualified Pension Benefits |  | Other Benefits
| 2012 |  | 2011 |  | 2012 |  | 2011 |  | 2012 |  | 2011
| (Dollars in thousands)
Components of net periodic benefit costs for the three months ended November 30, 2012 and 2011 is as follows: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 7,216 |  |  | $ | 6,502 |  |  | $ | 165 |  |  | $ | 172 |  |  | $ | 633 |  |  | $ | 510 |
Interest cost | 6,505 |  |  | 5,935 |  |  | 323 |  |  | 348 |  |  | 616 |  |  | 636 |
Expected return on assets | (11,956 | ) |  | (10,024 | ) |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost (credit) amortization | 399 |  |  | 458 |  |  | 57 |  |  | 57 |  |  | (4 | ) |  | (26 | )
Actuarial loss amortization | 5,231 |  |  | 3,732 |  |  | 211 |  |  | 112 |  |  | 223 |  |  | 207 |
Transition amount amortization |  |  |  |  |  |  |  |  |  |  |  |  | 175 |  |  | 234 |
Net periodic benefit cost | $ | 7,395 |  |  | $ | 6,603 |  |  | $ | 756 |  |  | $ | 689 |  |  | $ | 1,643 |  |  | $ | 1,561 |

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