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Employee Retirement Plans - Narrative (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Defined Benefit Plan Disclosure |  |  |
Amortization of prior service credits | $ 500,000 |  |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Contribution made to Pension Plan | 14,600,000 | $ 11,400,000 |
Projected benefit obligations of unfunded and non qualified supplemental executive retirement plans | 697,800,000 | 707,700,000 | $ 614,700,000
Pre-tax cost to sponsor unfunded and non-qualified supplemental executive retirement plans | 18,900,000 | 14,500,000 | 12,800,000
Net actuarial loss | 21,300,000 | 31,400,000 |
Fair value of pension and other postretirement benefit contributions | 0 | 0 |
Supplemental Employee Retirement Plans |  |  |
Defined Benefit Plan Disclosure |  |  |
Expected amortization of net actuarial losses | 1,100,000 |  |
Projected benefit obligations of unfunded and non qualified supplemental executive retirement plans | 50,700,000 | 47,400,000 |
Pre-tax cost to sponsor unfunded and non-qualified supplemental executive retirement plans | 3,100,000 | 2,600,000 | 2,300,000
Net actuarial loss | 11,300,000 | 13,000,000 |
Pension and other postretirement benefit contributions | 1,300,000 | 400,000 | 0
Fair value of pension and other postretirement benefit contributions | 31,800,000 | 28,400,000 |
U.S. Pension Plan | Pension Benefits |  |  |
Defined Benefit Plan Disclosure |  |  |
Expected amortization of net actuarial losses | 13,500,000 |  |
ABO for the pension plans | 605,200,000 | 601,300,000 |
Contribution made to Pension Plan | $ 11,400,000 | $ 9,900,000 | $ 11,100,000

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + 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 (j) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and 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 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1731-114919 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(10)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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