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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, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Japan |  |  |
Changes in fair value of plan assets: |  |  |
Fair value of plan assets at end of year | $ 11,472 |  |
United Kingdom |  |  |
Changes in fair value of plan assets: |  |  |
Fair value of plan assets at end of year | 52,105 |  |
Defined Benefit Pension Plan [Member] |  |  |
Changes in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 253,517 | $ 227,499 |
Plan amendments | 601 |  |
Obligation assumed in L'Orange aquisition |  | 39,257 |
Service cost | 3,487 | 2,767 | $ 2,808
Interest cost | 8,290 | 7,530 | 6,965
Net actuarial losses (gains) | 46,015 | (13,511) |
Contribution by participants | 9 | 43 |
Benefits paid | (9,294) | (8,539) |
Foreign currency exchange rate changes | (5,495) | (1,529) |
Projected benefit obligation at end of year | 297,130 | 253,517 | 227,499
Changes in fair value of plan assets: |  |  |
Fair value of plan assets at beginning of year | 227,722 | 224,712 |
Actual return on plan assets | 16,448 | 12,034 |
Contributions by the Company | 1,697 | 994 |
Contributions by plan participants | 9 | 43 |
Benefits paid (plan assets) | (9,294) | (8,539) |
Foreign currency exchange rate changes | (2,449) | (1,522) |
Fair value of plan assets at end of year | 234,133 | 227,722 | 224,712
Net (under)/over funded status at end of year | (62,997) | (25,795) |
Defined Benefit Pension Plan [Member] | United States [Member] |  |  |
Changes in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 150,032 | 161,130 |
Plan amendments |  |  |
Obligation assumed in L'Orange aquisition |  |  |
Service cost | 1,451 | 1,643 | 1,675
Interest cost | 6,384 | 6,004 | 5,757
Net actuarial losses (gains) | 23,841 | (13,128) |
Contribution by participants |  | 34 |
Benefits paid | (6,113) | (5,651) |
Foreign currency exchange rate changes |  |  |
Projected benefit obligation at end of year | 175,595 | 150,032 | 161,130
Changes in fair value of plan assets: |  |  |
Fair value of plan assets at beginning of year | 165,342 | 160,332 |
Actual return on plan assets | 11,327 | 10,627 |
Contributions by the Company |  |  |
Contributions by plan participants |  | 34 |
Benefits paid (plan assets) | (6,113) | (5,651) |
Foreign currency exchange rate changes |  |  |
Fair value of plan assets at end of year | 170,556 | 165,342 | 160,332
Net (under)/over funded status at end of year | (5,039) | 15,310 |
Defined Benefit Pension Plan [Member] | Other Countries [Member] |  |  |
Changes in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 103,485 | 66,369 |
Plan amendments | 601 |  |
Obligation assumed in L'Orange aquisition |  | 39,257 |
Service cost | 2,036 | 1,124 | 1,133
Interest cost | 1,906 | 1,526 | 1,208
Net actuarial losses (gains) | 22,174 | (383) |
Contribution by participants | 9 | 9 |
Benefits paid | (3,181) | (2,888) |
Foreign currency exchange rate changes | (5,495) | (1,529) |
Projected benefit obligation at end of year | 121,535 | 103,485 | 66,369
Changes in fair value of plan assets: |  |  |
Fair value of plan assets at beginning of year | 62,380 | 64,380 |
Actual return on plan assets | 5,121 | 1,407 |
Contributions by the Company | 1,697 | 994 |
Contributions by plan participants | 9 | 9 |
Benefits paid (plan assets) | (3,181) | (2,888) |
Foreign currency exchange rate changes | (2,449) | (1,522) |
Fair value of plan assets at end of year | 63,577 | 62,380 | 64,380
Net (under)/over funded status at end of year | (57,958) | (41,105) |
Defined Benefit Pension Plan [Member] | Japan |  |  |
Changes in projected benefit obligation: |  |  |
Projected benefit obligation at end of year | 11,110 |  |
Defined Benefit Pension Plan [Member] | United Kingdom |  |  |
Changes in projected benefit obligation: |  |  |
Plan amendments | 601 |  |
Projected benefit obligation at end of year | 58,494 |  |
Defined Benefit Pension Plan [Member] | Germany [Member] |  |  |
Changes in projected benefit obligation: |  |  |
Projected benefit obligation at end of year | 51,931 |  |
Other Postretirement Benefit Plans [Member] |  |  |
Changes in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 27,985 | 32,252 |
Service cost | 5 | 7 | 14
Interest cost | 1,154 | 1,165 | 1,244
Net actuarial losses (gains) | (373) | (2,716) |
Contribution by participants | 1,192 | 1,311 |
Benefits paid | (3,292) | (3,707) |
Curtailment (gain) loss |  | (330) |
Foreign currency exchange rate changes |  | 3 |
Projected benefit obligation at end of year | 26,671 | 27,985 | 32,252
Changes in fair value of plan assets: |  |  |
Fair value of plan assets at beginning of year |  |  |
Contributions by the Company | 2,100 | 2,396 |
Contributions by plan participants | 1,192 | 1,311 |
Benefits paid (plan assets) | (3,292) | (3,707) |
Fair value of plan assets at end of year |  |  |
Net (under)/over funded status at end of year | $ (26,671) | $ (27,985) |

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