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Employee Benefit Plans - Schedule of Assumptions Used (Details) | 12 Months Ended
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Jul. 31, 2017 Rate | Jul. 31, 2016 Rate | Jul. 31, 2015 Rate
Compensation and Retirement Disclosure [Abstract] |  |  |
Weighted average discount rate used in determining accumulated postretirement benefit obligation | 2.50% | 2.50% | 3.00%
Weighted average discount rate used in determining net periodic benefit cost | 2.50% | 3.00% | 3.41%
Assumed health care trend rate used to measure accumulated postretirement benefit obligation at July 31 | 7.25% | 7.50% | 7.00%
Rate to which cost trend rate is assumed to decline (the ultimate trend rate) | 5.50% | 5.50% | 5.50%
Fiscal year the ultimate trend rate is reached | 2024 | 2018 | 2018

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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The interest rate used to adjust for the time value of money. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The ultimate trend rate for health care costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Year the ultimate health care cost trend rate is expected to be reached, in CCYY format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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