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RETIREMENT PLANS - Benefit Obligations, Plan Assets, Annual Expense, Assumptions and Other Information of the Company's Defined Benefit Pension Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Amounts recognized in the Consolidated Balance Sheets consist of: |  |
Non-current assets | $ 62.7 | $ 64.1
Non-current liabilities | (73.0) | (76.7)
International Plan | Defined Benefit Pension Plan |  |
Change in projected benefit obligation: |  |
Benefit obligation at beginning of year | 108.5 | 109.2
Interest cost | 5.9 | 6.2
Actuarial (gain) loss | 5.1 | (11.0)
Benefits paid | (6.6) | (5.9)
Foreign currency translation | 10.3 | 10.0
Projected benefit obligation (“PBO”) at end of year | 123.2 | 108.5
Accumulated benefit obligation (“ABO”) at end of year | 123.2 | 108.5
Change in plan assets: |  |
Fair value of plan assets at beginning of year | 124.8 | 128.9
Actual return on plan assets | 10.0 | (11.5)
Employer contribution | 0.9 | 1.2
Benefits paid | (6.6) | (5.9)
Foreign currency translation | 12.3 | 12.1
Fair value of plan assets at end of year | 141.4 | 124.8
Overfunded (underfunded) status at end of year | 18.2 | 16.3
Information for pension plans with an ABO in excess of plan assets: |  |
Accumulated benefit obligation | 12.0 | 11.5
Fair value of plan assets | 0.0 | 0.0
Projected benefit obligation | 12.0 | 11.5
Amounts recognized in the Consolidated Balance Sheets consist of: |  |
Non-current assets | 30.2 | 27.8
Current liabilities | (0.9) | (0.9)
Non-current liabilities | (11.1) | (10.6)
Total amount accrued | 18.2 | 16.3
Amounts recognized in AOCL consist of: |  |
Actuarial loss | 64.1 | 60.0
Prior service cost | 2.3 | 2.1
Total amount recognized | 66.4 | 62.1
Total change in other comprehensive loss attributable to: |  |
Net gain (loss) during the period | (0.7) | (6.0)
Reclassification to net earnings | 2.3 | 2.0
Foreign currency translation | (5.9) | (4.8)
Total change in other comprehensive loss | $ (4.3) | $ (8.8)
Weighted average assumptions used in development of projected benefit obligation: |  |
Discount rate | 4.86% | 5.38%
U.S. Plan | Defined Benefit Pension Plan |  |
Change in projected benefit obligation: |  |
Benefit obligation at beginning of year | $ 71.8 | $ 77.7
Interest cost | 3.7 | 3.6
Actuarial (gain) loss | 5.5 | (2.5)
Benefits paid | (6.8) | (6.9)
Foreign currency translation | 0.0 | 0.0
Projected benefit obligation (“PBO”) at end of year | 74.2 | 71.8
Accumulated benefit obligation (“ABO”) at end of year | 74.2 | 71.8
Change in plan assets: |  |
Fair value of plan assets at beginning of year | 54.1 | 59.1
Actual return on plan assets | 7.1 | 1.7
Employer contribution | 2.9 | 0.2
Benefits paid | (6.8) | (6.9)
Foreign currency translation | 0.0 | 0.0
Fair value of plan assets at end of year | 57.3 | 54.1
Overfunded (underfunded) status at end of year | (16.9) | (17.7)
Information for pension plans with an ABO in excess of plan assets: |  |
Accumulated benefit obligation | 74.2 | 71.8
Fair value of plan assets | 57.3 | 54.1
Projected benefit obligation | 74.2 | 71.8
Amounts recognized in the Consolidated Balance Sheets consist of: |  |
Non-current assets | 0.0 | 0.0
Current liabilities | (0.2) | (0.2)
Non-current liabilities | (16.7) | (17.5)
Total amount accrued | (16.9) | (17.7)
Amounts recognized in AOCL consist of: |  |
Actuarial loss | 34.1 | 35.2
Prior service cost | 0.0 | 0.0
Total amount recognized | 34.1 | 35.2
Total change in other comprehensive loss attributable to: |  |
Net gain (loss) during the period | (0.5) | 1.8
Reclassification to net earnings | 1.7 | 1.8
Foreign currency translation | 0.0 | 0.0
Total change in other comprehensive loss | $ 1.2 | $ 3.6
Weighted average assumptions used in development of projected benefit obligation: |  |
Discount rate | 4.62% | 5.54%

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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480266/715-60-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (j) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (k) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-11 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 5: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-11 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A + Details
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- Definition Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 15 -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-15 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 17A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-17A + Details
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