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Employee Benefit Plans (Tables) | 9 Months Ended
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Apr. 30, 2015
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] | The components of net periodic postretirement benefit cost for the three and nine months ended April 30, 2015 and 2014 were as follows:
| Three months ended April 30, |  | Nine months ended April 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Components of net periodic postretirement benefit cost: |  |  |  |  |  |  |
Service cost | $ | 40 |  |  | $ | 168 |  |  | $ | 203 |  |  | $ | 505 |
Interest cost | 35 |  |  | 134 |  |  | 177 |  |  | 401 |
Amortization of prior service credit | (40 | ) |  | (51 | ) |  | (202 | ) |  | (152 | )
Amortization of net actuarial gain | (106 | ) |  | (66 | ) |  | (540 | ) |  | (199 | )
Curtailment gain | (4,296 | ) |  | — |  |  | (4,296 | ) |  | — |
Net periodic postretirement benefit cost | $ | (4,367 | ) |  | $ | 185 |  |  | $ | (4,658 | ) |  | $ | 555 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=34716465&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2439-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2410-114920 + Details
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