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Retirement Benefits (Tables) | 12 Months Ended
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Sep. 30, 2019
Defined Contribution Plan [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Amount of Expense Associated with Defined Contribution Plans |
|  |  | Year Ended September 30,
|  | 2019 |  | 2018 |  | 2017
Company costs |  | $ | 35,510 |  | $ | 34,084 |  | $ | 32,008
Defined Benefit Pension Plan [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Net Periodic Benefit Costs |
|  | Year Ended September 30,
|  | United States |  | Other Countries |  | Total
|  | 2019 |  | 2018 |  | 2017 |  | 2019 |  | 2018 |  | 2017 |  | 2019 |  | 2018 |  | 2017
Service cost |  | $ | 1,451 |  | $ | 1,643 |  | $ | 1,675 |  | $ | 2,036 |  | $ | 1,124 |  | $ | 1,133 |  | $ | 3,487 |  | $ | 2,767 |  | $ | 2,808
Interest cost |  |  | 6,384 |  |  | 6,004 |  |  | 5,757 |  |  | 1,906 |  |  | 1,526 |  |  | 1,208 |  |  | 8,290 |  |  | 7,530 |  |  | 6,965
Expected return on plan assets |  |  | (11,986) |  |  | (11,614) |  |  | (10,529) |  |  | (2,638) |  |  | (2,780) |  |  | (2,605) |  |  | (14,624) |  |  | (14,394) |  |  | (13,134)
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net losses |  |  | 617 |  |  | 598 |  |  | 1,854 |  |  | 283 |  |  | 291 |  |  | 514 |  |  | 900 |  |  | 889 |  |  | 2,368
Net prior service cost |  |  | 709 |  |  | 709 |  |  | 383 |  |  | - |  |  | - |  |  | - |  |  | 709 |  |  | 709 |  |  | 383
Net periodic (benefit) cost |  | $ | (2,825) |  | $ | (2,660) |  | $ | (860) |  | $ | 1,587 |  | $ | 161 |  | $ | 250 |  | $ | (1,238) |  | $ | (2,499) |  | $ | (610)
Schedule of Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan |
|  | At or for the Year Ended September 30,
|  | United States |  | Other Countries |  | Total
|  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Changes in projected benefit obligation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Projected benefit obligation at beginning of year |  | $ | 150,032 |  | $ | 161,130 |  | $ | 103,485 |  | $ | 66,369 |  | $ | 253,517 |  | $ | 227,499
Plan amendment |  |  | - |  |  | - |  |  | 601 |  |  | - |  |  | 601 |  |  | -
Obligation assumed in L'Orange acquisition |  |  | - |  |  | - |  |  | - |  |  | 39,257 |  |  | - |  |  | 39,257
Service cost |  |  | 1,451 |  |  | 1,643 |  |  | 2,036 |  |  | 1,124 |  |  | 3,487 |  |  | 2,767
Interest cost |  |  | 6,384 |  |  | 6,004 |  |  | 1,906 |  |  | 1,526 |  |  | 8,290 |  |  | 7,530
Net actuarial losses (gains) |  |  | 23,841 |  |  | (13,128) |  |  | 22,174 |  |  | (383) |  |  | 46,015 |  |  | (13,511)
Contribution by participants |  |  | - |  |  | 34 |  |  | 9 |  |  | 9 |  |  | 9 |  |  | 43
Benefits paid |  |  | (6,113) |  |  | (5,651) |  |  | (3,181) |  |  | (2,888) |  |  | (9,294) |  |  | (8,539)
Foreign currency exchange rate changes |  |  | - |  |  | - |  |  | (5,495) |  |  | (1,529) |  |  | (5,495) |  |  | (1,529)
Projected benefit obligation at end of year |  | $ | 175,595 |  | $ | 150,032 |  | $ | 121,535 |  | $ | 103,485 |  | $ | 297,130 |  | $ | 253,517
Changes in fair value of plan assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 165,342 |  | $ | 160,332 |  | $ | 62,380 |  | $ | 64,380 |  | $ | 227,722 |  | $ | 224,712
Actual return on plan assets |  |  | 11,327 |  |  | 10,627 |  |  | 5,121 |  |  | 1,407 |  |  | 16,448 |  |  | 12,034
Contributions by the Company |  |  | - |  |  | - |  |  | 1,697 |  |  | 994 |  |  | 1,697 |  |  | 994
Contributions by plan participants |  |  | - |  |  | 34 |  |  | 9 |  |  | 9 |  |  | 9 |  |  | 43
Benefits paid |  |  | (6,113) |  |  | (5,651) |  |  | (3,181) |  |  | (2,888) |  |  | (9,294) |  |  | (8,539)
Foreign currency exchange rate changes |  |  | - |  |  | - |  |  | (2,449) |  |  | (1,522) |  |  | (2,449) |  |  | (1,522)
Fair value of plan assets at end of year |  | $ | 170,556 |  | $ | 165,342 |  | $ | 63,577 |  | $ | 62,380 |  | $ | 234,133 |  | $ | 227,722
Net (under)/over funded status at end of year |  | $ | (5,039) |  | $ | 15,310 |  | $ | (57,958) |  | $ | (41,105) |  | $ | (62,997) |  | $ | (25,795)
Schedule of Accumulated Benefit Obligations In Excess of and Less Than Fair Value of Plan Assets |
|  | Plans with accumulated benefit obligation in excess of plan assets |  | Plans with accumulated benefit obligation less than plan assets
|  | At September 30, |  | At September 30,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Projected benefit obligation |  | $ | (286,495) |  | $ | (65,938) |  | $ | (10,635) |  | $ | (187,579)
Accumulated benefit obligation |  |  | (284,368) |  |  | (65,915) |  |  | (9,605) |  |  | (184,864)
Fair value of plan assets |  |  | 222,661 |  |  | 23,385 |  |  | 11,472 |  |  | 204,337
Schedule of Amounts Recognized in Balance Sheet and Other Comprehensive Income (Loss) |
|  | At or for the Year Ended September 30,
|  | United States |  | Other Countries |  | Total
|  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Amounts recognized in statement of financial position consist of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other non-current assets |  | $ | - |  | $ | 17,068 |  | $ | 838 |  | $ | 1,090 |  | $ | 838 |  | $ | 18,158
Accrued liabilities |  |  | - |  |  | - |  |  | (1,539) |  |  | (1,322) |  |  | (1,539) |  |  | (1,322)
Other non-current liabilities |  |  | (5,039) |  |  | (1,758) |  |  | (57,256) |  |  | (40,873) |  |  | (62,295) |  |  | (42,631)
Net (under)/over funded status at end of year |  | $ | (5,039) |  | $ | 15,310 |  | $ | (57,957) |  | $ | (41,105) |  | $ | (62,996) |  | $ | (25,795)
Amounts recognized in accumulated other ‎comprehensive income consist of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized net prior service cost |  | $ | 5,750 |  | $ | 6,459 |  | $ | 579 |  | $ | - |  | $ | 6,329 |  | $ | 6,459
Unrecognized net losses |  |  | 28,167 |  |  | 4,285 |  |  | 32,641 |  |  | 14,529 |  |  | 60,808 |  |  | 18,814
Total amounts recognized |  |  | 33,917 |  |  | 10,744 |  |  | 33,220 |  |  | 14,529 |  |  | 67,137 |  |  | 25,273
Deferred taxes |  |  | (11,577) |  |  | (5,892) |  |  | (10,029) |  |  | (5,081) |  |  | (21,606) |  |  | (10,973)
Amounts recognized in accumulated other comprehensive income |  | $ | 22,340 |  | $ | 4,852 |  | $ | 23,191 |  | $ | 9,448 |  | $ | 45,531 |  | $ | 14,300
Schedule of Changes in Plan Assets and Benefit Obligations Recorded in Other Comprehensive Income (Loss) |
|  | Year Ended September 30,
|  | United States |  | Other Countries |  | Total
|  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Accumulated other comprehensive losses at beginning of year |  | $ | 10,744 |  | $ | 24,192 |  | $ | 14,529 |  | $ | 14,198 |  | $ | 25,273 |  | $ | 38,390
Net loss (gain) |  |  | 24,499 |  |  | (12,141) |  |  | 19,691 |  |  | 990 |  |  | 44,190 |  |  | (11,151)
Prior service cost due to plan amendment |  |  | - |  |  | - |  |  | 601 |  |  | - |  |  | 601 |  | $ | -
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net losses |  |  | (617) |  |  | (598) |  |  | (283) |  |  | (292) |  |  | (900) |  |  | (890)
Prior service cost |  |  | (709) |  |  | (709) |  |  | - |  |  | - |  |  | (709) |  |  | (709)
Foreign currency exchange rate changes |  |  | - |  |  | - |  |  | (1,318) |  |  | (367) |  |  | (1,318) |  |  | (367)
Accumulated other comprehensive losses at end of year |  | $ | 33,917 |  | $ | 10,744 |  | $ | 33,220 |  | $ | 14,529 |  | $ | 67,137 |  | $ | 25,273
Schedule of Amounts Expected to be Amortized from Accumulated Other Comprehensive Income (Loss) and Reported as a Component of Net Periodic Benefit Cost During the Next Fiscal Year |
|  | United States |  | Other Countries |  | Total
Prior service cost |  | $ | 936 |  | $ | 22 |  | $ | 958
Net actuarial losses |  |  | 1,430 |  |  | 1,017 |  |  | 2,447
Schedule of Expected Benefit Payments |
Year Ending September 30, |  | United States |  | Other Countries |  | Total
2020 |  | $ | 7,170 |  | $ | 3,631 |  | $ | 10,801
2021 |  |  | 7,823 |  |  | 3,363 |  |  | 11,186
2022 |  |  | 8,383 |  |  | 3,239 |  |  | 11,622
2023 |  |  | 8,924 |  |  | 3,805 |  |  | 12,729
2024 |  |  | 9,385 |  |  | 3,695 |  |  | 13,080
2025 – 2029 |  |  | 51,139 |  |  | 19,494 |  |  | 70,633
Schedule of Allocation of Plan Assets, Actual and Target Allocations |
|  | At September 30,
|  | 2019 |  | 2018
|  | Percentage of Plan Assets |  | Target Allocation Ranges |  | Percentage of Plan Assets |  | Target Allocation Ranges
United States: |  |  |  |  |  |  |  |  |  |  |  |
Asset Class |  |  |  |  |  |  |  |  |  |  |  |
Equity Securities |  | 60.6% |  | 41.4% | - | 81.4% |  | 65.1% |  | 41.5% | - | 81.5%
Debt Securities |  | 37.9% |  | 28.6% | - | 48.6% |  | 33.1% |  | 28.5% | - | 48.5%
Other |  | 1.5% |  | 0.0% |  | 1.8% |  | 0.0%
|  | 100.0% |  |  |  |  |  | 100.0% |  |  |  |
United Kingdom: |  |  |  |  |  |  |  |  |  |  |  |
Asset Class |  |  |  |  |  |  |  |  |  |  |  |
Equity Securities |  | 41.6% |  | 30.0% | - | 60.0% |  | 44.8% |  | 30.0% | - | 60.0%
Debt Securities |  | 57.8% |  | 45.0% | - | 70.0% |  | 54.8% |  | 45.0% | - | 70.0%
Other |  | 0.6% |  | 0.0% |  | 0.4% |  | 0.0%
|  | 100.0% |  |  |  |  |  | 100.0% |  |  |  |
Japan: |  |  |  |  |  |  |  |  |  |  |  |
Asset Class |  |  |  |  |  |  |  |  |  |  |  |
Equity Securities |  | 41.4% |  | 36.0% | - | 44.0% |  | 41.0% |  | 36.0% | - | 44.0%
Debt Securities |  | 57.7% |  | 55.0% | - | 63.0% |  | 58.1% |  | 55.0% | - | 63.0%
Other |  | 0.9% |  | 0.0% | - | 2.0% |  | 0.9% |  | 0.0% | - | 2.0%
|  | 100.0% |  |  |  |  |  | 100.0% |  |  |  |
Schedule of Allocation of Plan Assets, Fair Value Hierarchy |
|  | At September 30, 2019
|  | Level 1 |  | Level 2 |  | Level 3 |  |  |
|  | United States |  | Other Countries |  | United States |  | Other Countries |  | United States |  | Other Countries |  | Total
Asset Category: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 2,568 |  | $ | 418 |  | $ | - |  | $ | - |  | $ | - |  | $ | - |  | $ | 2,986
Mutual funds: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. corporate bond fund |  |  | 64,514 |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 64,514
U.S. equity large cap fund |  |  | 56,829 |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 56,829
International equity large cap growth fund |  |  | 46,645 |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 46,645
Pooled funds: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Japanese equity securities |  |  | - |  |  | - |  |  | - |  |  | 2,518 |  |  | - |  |  | - |  |  | 2,518
International equity securities |  |  | - |  |  | - |  |  | - |  |  | 2,226 |  |  | - |  |  | - |  |  | 2,226
Japanese fixed income securities |  |  | - |  |  | - |  |  | - |  |  | 4,915 |  |  | - |  |  | - |  |  | 4,915
International fixed income securities |  |  | - |  |  | - |  |  | - |  |  | 1,710 |  |  | - |  |  | - |  |  | 1,710
Global target return equity/bond fund |  |  | - |  |  | - |  |  | - |  |  | 12,488 |  |  | - |  |  | - |  |  | 12,488
Index linked U.K. equity fund |  |  | - |  |  | - |  |  | - |  |  | 3,738 |  |  | - |  |  | - |  |  | 3,738
Index linked international equity fund |  |  | - |  |  | - |  |  | - |  |  | 5,438 |  |  | - |  |  | - |  |  | 5,438
Index linked U.K. corporate bonds fund |  |  | - |  |  | - |  |  | - |  |  | 16,737 |  |  | - |  |  | - |  |  | 16,737
Index linked U.K. government securities fund |  |  | - |  |  | - |  |  | - |  |  | 5,491 |  |  | - |  |  | - |  |  | 5,491
Index linked U.K. long-term government securities fund |  |  | - |  |  | - |  |  | - |  |  | 7,898 |  |  | - |  |  | - |  |  | 7,898
Total assets |  | $ | 170,556 |  | $ | 418 |  | $ | - |  | $ | 63,159 |  | $ | - |  | $ | - |  | $ | 234,133
|  | At September 30, 2018
|  | Level 1 |  | Level 2 |  | Level 3 |  |  |
|  | United States |  | Other Countries |  | United States |  | Other Countries |  | United States |  | Other Countries |  | Total
Asset Category: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 2,908 |  | $ | 317 |  | $ | - |  | $ | - |  | $ | - |  | $ | - |  | $ | 3,225
Mutual funds: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. corporate bond fund |  |  | 54,699 |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 54,699
U.S. equity large cap fund |  |  | 60,176 |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 60,176
International equity large cap growth fund |  |  | 47,559 |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 47,559
Pooled funds: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Japanese equity securities |  |  | - |  |  | - |  |  | - |  |  | 2,506 |  |  | - |  |  | - |  |  | 2,506
International equity securities |  |  | - |  |  | - |  |  | - |  |  | 2,214 |  |  | - |  |  | - |  |  | 2,214
Japanese fixed income securities |  |  | - |  |  | - |  |  | - |  |  | 4,968 |  |  | - |  |  | - |  |  | 4,968
International fixed income securities |  |  | - |  |  | - |  |  | - |  |  | 1,730 |  |  | - |  |  | - |  |  | 1,730
Global target return equity/bond fund |  |  | - |  |  | - |  |  | - |  |  | 12,495 |  |  | - |  |  | - |  |  | 12,495
Index linked U.K. equity fund |  |  | - |  |  | - |  |  | - |  |  | 4,326 |  |  | - |  |  | - |  |  | 4,326
Index linked international equity fund |  |  | - |  |  | - |  |  | - |  |  | 5,973 |  |  | - |  |  | - |  |  | 5,973
Index linked U.K. corporate bonds fund |  |  | - |  |  | - |  |  | - |  |  | 16,121 |  |  | - |  |  | - |  |  | 16,121
Index linked U.K. government securities fund |  |  | - |  |  | - |  |  | - |  |  | 4,913 |  |  | - |  |  | - |  |  | 4,913
Index linked U.K. long-term government securities fund |  |  | - |  |  | - |  |  | - |  |  | 6,817 |  |  | - |  |  | - |  |  | 6,817
Total assets |  | $ | 165,342 |  | $ | 317 |  | $ | - |  | $ | 62,063 |  | $ | - |  | $ | - |  | $ | 227,722
Other Postretirement Benefit Plans [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Net Periodic Benefit Costs |
|  | Year Ended September 30,
|  | 2019 |  | 2018 |  | 2017
Service cost |  | $ | 5 |  | $ | 7 |  | $ | 14
Interest cost |  |  | 1,154 |  |  | 1,165 |  |  | 1,244
Amortization of: |  |  |  |  |  |  |  |  |
Net losses |  |  | 55 |  |  | 94 |  |  | 201
Net prior service benefit |  |  | (5) |  |  | (158) |  |  | (158)
Curtailment gain |  |  | - |  |  | (330) |  |  | -
Net periodic cost |  | $ | 1,209 |  | $ | 778 |  | $ | 1,301
Schedule of Actuarial Assumptions Used |
| 2019 |  | 2018 |  | 2017
Weighted-average discount rate used to determine benefit obligation at September 30 | 3.05 | % |  | 4.30 | % |  | 3.78 | %
Weighted-average discount rate used to determine net periodic benefit cost for years ended September 30 | 4.30 |  |  | 3.80 |  |  | 3.63 |
Schedule of Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan |
|  | Year Ended September 30,
|  | 2019 |  | 2018
Changes in accumulated postretirement benefit obligation: |  |  |  |  |  |
Accumulated postretirement benefit obligation at beginning of year |  | $ | 27,985 |  | $ | 32,252
Service cost |  |  | 5 |  |  | 7
Interest cost |  |  | 1,154 |  |  | 1,165
Premiums paid by plan participants |  |  | 1,192 |  |  | 1,311
Net actuarial gains |  |  | (373) |  |  | (2,716)
Benefits paid |  |  | (3,292) |  |  | (3,707)
Curtailment |  |  | - |  |  | (330)
Foreign currency exchange rate changes |  |  | - |  |  | 3
Accumulated postretirement benefit obligation at end of year |  | $ | 26,671 |  | $ | 27,985
Changes in fair value of plan assets: |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | - |  | $ | -
Contributions by the company |  |  | 2,100 |  |  | 2,396
Premiums paid by plan participants |  |  | 1,192 |  |  | 1,311
Benefits paid |  |  | (3,292) |  |  | (3,707)
Fair value of plan assets at end of year |  | $ | - |  | $ | -
Funded status at end of year |  | $ | (26,671) |  | $ | (27,985)
Schedule of Amounts Recognized in Balance Sheet and Other Comprehensive Income (Loss) |
|  | Year Ended September 30,
|  | 2019 |  | 2018
Amounts recognized in statement of financial position consist of: |  |  |  |  |  |
Accrued liabilities |  | $ | (2,048) |  | $ | (2,249)
Other non-current liabilities |  |  | (24,623) |  |  | (25,736)
Funded status at end of year |  | $ | (26,671) |  | $ | (27,985)
Amounts recognized in accumulated other comprehensive income consist of: |  |  |  |  |  |
Unrecognized net prior service (benefit) cost |  | $ | 4 |  | $ | (1)
Unrecognized net (gains) losses |  |  | (3) |  |  | 425
Total amounts recognized |  |  | 1 |  |  | 424
Deferred taxes |  |  | (414) |  |  | (518)
Amounts recognized in accumulated other comprehensive income |  | $ | (413) |  | $ | (94)
Schedule of Changes in Plan Assets and Benefit Obligations Recorded in Other Comprehensive Income (Loss) |
|  | Year Ended September 30,
|  | 2019 |  | 2018
Accumulated other comprehensive losses at beginning of year |  | $ | 424 |  | $ | 3,074
Net gain |  |  | (373) |  |  | (2,654)
Curtailment arising during the period |  |  | - |  |  | (59)
Amortization of: |  |  |  |  |  |
Net losses |  |  | (55) |  |  | (95)
Prior service benefit |  |  | 5 |  |  | 158
Accumulated other comprehensive losses at end of year |  | $ | 1 |  | $ | 424
Schedule of Health Care Cost Trend Rates |
|  |  |  | 2019 |  | 2018
Health care cost trend rate assumed for next year |  |  |  | 6.25 | % |  | 6.50 | %
Rate to which the cost trend rate is assumed to decline |  |  |  |  |  |  |  |
(the ultimate trend rate) |  |  |  | 5.00 | % |  | 5.00 | %
Year that the rate reaches the ultimate trend rate |  |  |  | 2025 |  |  | 2025 |
Schedule of Health Care Costs Sensitivity |
|  |  | Change In Health Care Cost Trend Rate
|  |  | 1% increase |  | 1% decrease
Effect on projected fiscal year 2020 service and interest cost |  |  | $ | 74 |  | $ | (65)
Effect on accumulated postretirement benefit obligation at September 30, 2019 |  |  |  | 2,417 |  |  | (2,128)
Schedule of Future Postretirement Company Contributions |
Year Ending September 30, |  |  |
2020 |  | $ | 3,237
2021 |  |  | 3,220
2022 |  |  | 3,183
2023 |  |  | 3,125
2024 |  |  | 3,061
2025 – 2029 |  |  | 13,891
Multiemployer Plans, Pension [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Amounts of Contributions Associated with Multiemployer Defined Benefit Plans |
|  |  | Year Ended September 30,
|  | 2019 |  | 2018 |  | 2017
Company contributions |  | $ | 252 |  | $ | 334 |  | $ | 292
United States [Member] | Defined Benefit Pension Plan [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Actuarial Assumptions Used |
| 2019 |  | 2018 |  | 2017
United States: |  |  |  |  |  |  |  |
Weighted-average assumptions to determine benefit obligation at September 30: |  |  |  |  |  |  |  |
Discount rate | 3.25 | % |  | 4.35 | % |  | 3.80 | %
Weighted-average assumptions to determine periodic benefit costs for years ended September 30: |  |  |  |  |  |  |  |
Discount rate | 4.35 |  |  | 3.80 |  |  | 3.65 |
Long-term rate of return on plan assets | 7.39 |  |  | 7.39 |  |  | 7.38 |
United Kingdom | Defined Benefit Pension Plan [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Actuarial Assumptions Used |
| 2019 |  | 2018 |  | 2017
United Kingdom: |  |  |  |  |  |  |  |
Weighted-average assumptions to determine benefit obligation at September 30: |  |  |  |  |  |  |  |
Discount rate | 1.74 | % |  | 2.68 | % |  | 2.56 | %
Rate of compensation increase | 3.50 |  |  | 3.60 |  |  | 3.60 |
Weighted-average assumptions to determine periodic benefit costs for years ended September 30: |  |  |  |  |  |  |  |
Discount rate - service cost | 2.70 |  |  | 2.58 |  |  | 2.33 |
Discount rate - interest cost | 2.51 |  |  | 2.36 |  |  | 2.24 |
Rate of compensation increase | 3.60 |  |  | 3.60 |  |  | 3.40 |
Long-term rate of return on plan assets | 4.75 |  |  | 4.75 |  |  | 4.75 |
Japan | Defined Benefit Pension Plan [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Actuarial Assumptions Used |
| 2019 |  | 2018 |  | 2017
Japan: |  |  |  |  |  |  |  |
Weighted-average assumptions to determine benefit obligation at September 30: |  |  |  |  |  |  |  |
Discount rate | 0.53 | % |  | 0.62 | % |  | 0.58 | %
Rate of compensation increase | 2.00 |  |  | 2.00 |  |  | 2.00 |
Weighted-average assumptions to determine periodic benefit costs for years ended September 30: |  |  |  |  |  |  |  |
Discount rate - service cost | 0.80 |  |  | 0.72 |  |  | 0.59 |
Discount rate - interest cost | 0.42 |  |  | 0.38 |  |  | 0.45 |
Rate of compensation increase | 2.00 |  |  | 2.00 |  |  | 2.02 |
Long-term rate of return on plan assets | 2.50 |  |  | 2.50 |  |  | 2.50 |
Germany [Member] | Defined Benefit Pension Plan [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Actuarial Assumptions Used |
| 2019 |  | 2018 |  | 2017
Germany: |  |  |  |  |  |  |  |
Weighted-average assumptions to determine benefit obligation at September 30: |  |  |  |  |  |  |  |
Discount rate | 0.81 | % |  | 1.87 | % |  | n/a |
Rate of compensation increase | 2.50 |  |  | 2.50 |  |  | n/a |
Weighted-average assumptions to determine periodic benefit costs for years ended September 30: |  |  |  |  |  |  |  |
Discount rate - service cost | 2.06 |  |  | 2.05 |  |  | n/a |
Discount rate - interest cost | 1.53 |  |  | 1.49 |  |  | n/a |
Rate of compensation increase | 2.50 |  |  | 2.50 |  |  | n/a |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of defined contribution pension plans or defined contribution other postretirement plans, separately for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Tabular disclosure of the amounts related to pension plans and/or other employee benefit plans in accumulated other comprehensive income (loss) expected to be recognized as components of net periodic benefit cost over the next fiscal year, including the net gain (loss), net prior service cost or credit, and net transition asset or obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the effect of a one-percentage-point increase and the effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs and the accumulated postretirement benefit obligation for health care benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the quantitative and qualitative information related to multiemployer plans in which the employer participates. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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