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Benefit Plans Schedule of Net Benefit Costs (Tables) | 6 Months Ended
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Feb. 28, 2013
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
| 2013 |  | 2012 |  | 2013 |  | 2012 |  | 2013 |  | 2012
Components of net periodic benefit costs for the three months ended February 28, 2013 and February 29, 2012 is as follows: |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 7,216 |  |  | $ | 6,501 |  |  | $ | 164 |  |  | $ | (31 | ) |  | $ | 634 |  |  | $ | 511 |
Interest cost | 6,501 |  |  | 5,909 |  |  | 324 |  |  | 348 |  |  | 616 |  |  | 637 |
Expected return on assets | (11,967 | ) |  | (9,985 | ) |  |  |  |  |  |  |  |
Prior service cost (credit) amortization | 400 |  |  | 458 |  |  | 57 |  |  | 57 |  |  | (5 | ) |  | (26 | )
Actuarial loss amortization | 5,230 |  |  | 3,744 |  |  | 211 |  |  | 113 |  |  | 223 |  |  | 206 |
Transition amount amortization |  |  |  |  |  |  |  |  | 174 |  |  | 234 |
Net periodic benefit cost | $ | 7,380 |  |  | $ | 6,627 |  |  | $ | 756 |  |  | $ | 487 |  |  | $ | 1,642 |  |  | $ | 1,562 |
Components of net periodic benefit costs for the six months ended February 28, 2013 and February 29, 2012 is as follows: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 14,432 |  |  | $ | 13,003 |  |  | $ | 329 |  |  | $ | 141 |  |  | $ | 1,267 |  |  | $ | 1,021 |
Interest cost | 13,006 |  |  | 11,844 |  |  | 647 |  |  | 696 |  |  | 1,232 |  |  | 1,273 |
Expected return on assets | (23,923 | ) |  | (20,009 | ) |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost (credit) amortization | 799 |  |  | 916 |  |  | 114 |  |  | 114 |  |  | (9 | ) |  | (52 | )
Actuarial loss amortization | 10,461 |  |  | 7,476 |  |  | 422 |  |  | 225 |  |  | 446 |  |  | 413 |
Transition amount amortization |  |  |  |  |  |  |  |  |  |  |  |  | 349 |  |  | 468 |
Net periodic benefit cost | $ | 14,775 |  |  | $ | 13,230 |  |  | $ | 1,512 |  |  | $ | 1,176 |  |  | $ | 3,285 |  |  | $ | 3,123 |

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