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Postretirement and Other Employee Benefits (Additional Information) (Details 2) - USD ($) $ in Millions | 12 Months Ended
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Aug. 31, 2017 | Aug. 31, 2016 | Aug. 31, 2015
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |
Net actuarial loss expected to be amortized to net period benefit cost in next fiscal year | $ 1.1 |  |
Prior service credit expected to be amortized to net periodic benefit cost in next fiscal year | (0.1) |  |
Company contributions | 33.6 | $ 33.3 | $ 36.8
Minimum |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |
Contributions expected to funded pension plans during fiscal year 2018 | 2.7 |  |
Maximum |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |
Contributions expected to funded pension plans during fiscal year 2018 | $ 3.5 |  |
Global equity securities |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |
Target allocation percentage | 35.00% |  |
Debt Securities |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |
Target allocation percentage | 65.00% |  |

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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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