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Retirement Benefits (Schedule of Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Pension Plans, Defined Benefit [Member] |  |  |
Changes in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | $ 201,275 | $ 190,423 |
Service cost | 2,802 | 4,504 | $ 5,660
Interest cost | 8,084 | 8,792 | 7,682
Net actuarial (gains) losses | 6,921 | 15,461 |
Contribution by participants | 51 | 91 |
Benefits paid | (6,502) | (6,050) |
Amounts paid by Company for Pension Protection Fund levy | 0 | (13) |
Plan amendments | 0 | 3,355 |
Settlements | 0 | (1,985) |
Curtailments | 0 | (12,258) |
Foreign currency exchange rate changes | (4,530) | (1,045) |
Projected benefit obligation at end of year | 208,101 | 201,275 | 190,423
Changes in fair value of plan assets: |  |  |
Fair value of plan assets at beginning of year | 205,161 | 190,175 |
Actual return on plan assets | 440 | 20,976 |
Contributions by the company | 1,568 | 2,962 |
Contributions by plan participants | 51 | 91 |
Benefits paid | (6,502) | (6,050) |
Settlements | 0 | (1,985) |
Foreign currency exchange rate changes | (4,465) | (1,008) |
Fair value of plan assets at end of year | 196,253 | 205,161 | 190,175
Net over/(under)funded status at end of year | (11,848) | 3,886 |
United States Pension Plans of US Entity, Defined Benefit [Member] |  |  |
Changes in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 137,740 | 126,532 |
Service cost | 2,018 | 3,516 | 4,608
Interest cost | 5,956 | 6,382 | 5,569
Net actuarial (gains) losses | 4,206 | 12,446 |
Contribution by participants | 28 | 0 |
Benefits paid | (4,078) | (3,732) |
Amounts paid by Company for Pension Protection Fund levy | 0 | 0 |
Plan amendments | 0 | 3,355 |
Settlements | 0 | 0 |
Curtailments | 0 | (10,759) |
Foreign currency exchange rate changes | 0 | 0 |
Projected benefit obligation at end of year | 145,870 | 137,740 | 126,532
Changes in fair value of plan assets: |  |  |
Fair value of plan assets at beginning of year | 142,090 | 129,518 |
Actual return on plan assets | (2,535) | 15,764 |
Contributions by the company | 85 | 540 |
Contributions by plan participants | 28 | 0 |
Benefits paid | (4,078) | (3,732) |
Settlements | 0 | 0 |
Foreign currency exchange rate changes | 0 | 0 |
Fair value of plan assets at end of year | 135,590 | 142,090 | 129,518
Net over/(under)funded status at end of year | (10,280) | 4,350 |
Foreign Pension Plans, Defined Benefit [Member] |  |  |
Changes in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 63,535 | 63,891 |
Service cost | 784 | 988 | 1,052
Interest cost | 2,128 | 2,410 | 2,113
Net actuarial (gains) losses | 2,715 | 3,015 |
Contribution by participants | 23 | 91 |
Benefits paid | (2,424) | (2,318) |
Amounts paid by Company for Pension Protection Fund levy | 0 | (13) |
Plan amendments | 0 | 0 |
Settlements | 0 | (1,985) |
Curtailments | 0 | (1,499) |
Foreign currency exchange rate changes | (4,530) | (1,045) |
Projected benefit obligation at end of year | 62,231 | 63,535 | 63,891
Changes in fair value of plan assets: |  |  |
Fair value of plan assets at beginning of year | 63,071 | 60,657 |
Actual return on plan assets | 2,975 | 5,212 |
Contributions by the company | 1,483 | 2,422 |
Contributions by plan participants | 23 | 91 |
Benefits paid | (2,424) | (2,318) |
Settlements | 0 | (1,985) |
Foreign currency exchange rate changes | (4,465) | (1,008) |
Fair value of plan assets at end of year | 60,663 | 63,071 | 60,657
Net over/(under)funded status at end of year | (1,568) | (464) |
United Kingdom Plan, Defined Benefit [Member] |  |  |
Changes in projected benefit obligation: |  |  |
Projected benefit obligation at end of year | 52,295 |  |
Changes in fair value of plan assets: |  |  |
Fair value of plan assets at end of year | 50,033 |  |
Japan Plan, Defined Benefit [Member] |  |  |
Changes in projected benefit obligation: |  |  |
Projected benefit obligation at end of year | 9,936 |  |
Changes in fair value of plan assets: |  |  |
Fair value of plan assets at end of year | 10,630 |  |
Other Postretirement Benefit Plans, Defined Benefit [Member] |  |  |
Changes in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 29,225 | 28,996 |
Service cost | 30 | 47 | 71
Interest cost | 1,233 | 1,432 | 1,244
Net actuarial (gains) losses | 6,705 | 1,145 |
Contribution by participants | 1,613 | 1,843 |
Benefits paid | (3,848) | (4,243) |
Foreign currency exchange rate changes | (31) | 5 |
Projected benefit obligation at end of year | 34,927 | 29,225 | 28,996
Changes in fair value of plan assets: |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |
Contributions by the company | 2,235 | 2,400 |
Contributions by plan participants | 1,613 | 1,843 |
Benefits paid | (3,848) | (4,243) |
Fair value of plan assets at end of year | 0 | 0 | $ 0
Net over/(under)funded status at end of year | $ (34,927) | $ (29,225) |

X
- Definition The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost) -URI http://asc.fasb.org/extlink&oid=6504192 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6504226 + Details
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- Definition Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=49168827 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition 1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. + 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 (a) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Projected Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6522206 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Postretirement Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503904 + Details
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- Definition The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Benefits -URI http://asc.fasb.org/extlink&oid=49170737 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Postretirement Benefits -URI http://asc.fasb.org/extlink&oid=6521376 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + 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 (b)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets. + 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 (b)(4) -URI http://asc.fasb.org/extlink&oid=58740216&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 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The amount of decrease that is related to an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. + 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 (a)(10) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Curtailment -URI http://asc.fasb.org/extlink&oid=6520938 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) from foreign currency exchange rate changes for benefit obligation for plans of a foreign operation whose functional currency is not the reporting currency. + 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 (a)(5) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The amount of increase or decrease in plan assets attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency. + 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 (b)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total. + 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=58740216&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 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 + Details
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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + 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 (h)(2) -URI http://asc.fasb.org/extlink&oid=58740216&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 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Amendment -URI http://asc.fasb.org/extlink&oid=49173939 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The amount of decrease that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The amount paid directly by the Company for the Pension Protection Fund (PPF) levy in the United Kingdom. The PPF is the equivalent to the PBGC in the US. The payment is included in the annual service cost of the plan and therefore the payment by the Company serves to offset this cost so the net effect on PBO is zero. + References No definition available. + Details
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