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Pay vs Performance Disclosure | 12 Months Ended
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Sep. 30, 2024 USD ($) $ / shares | Sep. 30, 2023 USD ($) $ / shares | Sep. 30, 2022 USD ($) $ / shares | Sep. 30, 2021 USD ($) $ / shares
Pay vs Performance Disclosure |  |  |  |
Pay vs Performance Disclosure, Table |
| Summary Compensation Table Total for PEO | Compensation Actually Paid to PEO(2) | Average Summary Compensation Table Total for non‑PEO NEOs | Average Compensation Actually Paid to non‑PEO NEOs(3) |  | Value of Fixed $100 Investment Based on: |  |  |  | Company Selected Performance Measure: NFEPS (non‑GAAP)(6)
Year(1) |  | Total Shareholder Return(4) | Peer Group Total Shareholder Return(5) |  | Net income (in millions)
2024 |  | $ | 7,208,109 |  |  | $ | 6,204,727 |  |  | $ | 1,467,015 |  |  | $ | 1,450,940 |  |  |  | $ | 202.03 |  |  | $ | 153.05 |  |  |  | $ | 289.8 |  |  | $ | 2.95 |
2023 |  | $ | 5,783,114 |  |  | $ | 5,741,932 |  |  | $ | 1,325,893 |  |  | $ | 1,373,409 |  |  |  | $ | 167.33 |  |  | $ | 107.92 |  |  |  | $ | 264.7 |  |  | $ | 2.70 |
2022 |  | $ | 4,612,774 |  |  | $ | 5,172,954 |  |  | $ | 1,262,377 |  |  | $ | 1,643,461 |  |  |  | $ | 154.17 |  |  | $ | 116.06 |  |  |  | $ | 274.9 |  |  | $ | 2.50 |
2021 |  | $ | 4,783,459 |  |  | $ | 4,867,585 |  |  | $ | 1,306,918 |  |  | $ | 1,362,313 |  |  |  | $ | 133.89 |  |  | $ | 109.93 |  |  |  | $ | 117.9 |  |  | $ | 2.16 |
Company Selected Measure Name | NFEPS |  |  |
Named Executive Officers, Footnote | The PEO and non-PEO NEOs for the indicated years were as follows: For fiscal year 2024, our PEO was Stephen D. Westhoven and our non-PEO NEOs were Roberto F. Bel, Patrick J. Migliaccio, Amy Cradic and Richard Reich. For fiscal year 2023, our PEO was Stephen D. Westhoven and our non-PEO NEOs were Roberto F. Bel, Patrick J. Migliaccio, Amy Cradic and Lori DelGiudice. For fiscal year 2022, our PEO was Stephen D. Westhoven and our non-PEO NEOs were Roberto F. Bel, Patrick J. Migliaccio, Amy Cradic, Richard Reich and Timothy F. Shea. For fiscal year 2021, our PEO was Stephen D. Westhoven and our non-PEO NEOs were Patrick J. Migliaccio, Amy Cradic, Amanda E. Mullen, Timothy F. Shea and Nancy A. Washington. |  |  |
Peer Group Issuers, Footnote | Total Shareholder Return is cumulative for the measurement periods beginning on September 30, 2020, and ending on September 30 of each of 2024, 2023, 2022 and 2021 respectively, calculated in accordance with Item 201(e) of Regulation S-K. |  |  |
PEO Total Compensation Amount | $ 7,208,109 | $ 5,783,114 | $ 4,612,774 | $ 4,783,459
PEO Actually Paid Compensation Amount | $ 6,204,727 | 5,741,932 | 5,172,954 | 4,867,585
Adjustment To PEO Compensation, Footnote | Amounts reported in this column represent compensation actually paid; adjustments were made to the amounts reported in the Summary Compensation Table for the applicable fiscal year. A reconciliation of the adjustments for our PEO is set forth in the following table, which describes the adjustments, each of which is prescribed by the SEC rules, to calculate the compensation actually paid amounts from Summary Compensation amounts.
|  | FY 2024 |  | FY 2023 |  | FY 2022 |  | FY 2021
Total Compensation for PEO as reported in the Summary Compensation Table for the covered fiscal year |  | $7,208,109 |  | $5,783,114 |  | $4,612,774 |  | $4,783,459
Deduct pension values reported in the “Change in Pension and Nonqualified Deferred Compensation Earnings” column in the Summary Compensation Table for the covered fiscal year |  | (1,497,079) |  |  | (627,726) |  |  | — |  |  | (782,952) |
Deduct grant date fair value of equity awards reported in the “Stock Awards” column in the Summary Compensation Table for the covered fiscal year |  | (3,266,351) |  |  | (2,768,004) |  |  | (2,254,623) |  |  | (1,822,848) |
Add actuarial present value of pension value attributable to covered fiscal year’s service |  | 128,658 |  |  | 123,925 |  |  | 166,246 |  |  | 170,574 |
Add the entire cost of benefits granted (or credit for benefits reduced) in a plan amendment (or initiation) during the covered fiscal year that are attributed by the benefit formula to services rendered in periods prior to the plan amendment or initiation |  | — |  |  | — |  |  | — |  |  | — |
Add fair values as of the end of the covered fiscal year of all equity awards granted during the covered fiscal year that are outstanding and unvested as of the end of such covered fiscal year |  | 2,662,269 |  |  | 1,491,710 |  |  | 2,356,927 |  |  | 2,076,852 |
Add fair value as of the vesting date of any awards granted in the covered fiscal year that vested during the covered fiscal year |  | — |  |  | 1,243,197 |  |  | — |  |  | — |
Add dividends paid on unvested shares/share units and stock options |  | 359,424 |  |  | 264,932 |  |  | 196,267 |  |  | 144,422 |
Add the change in fair value (whether positive or negative) as of the end of the covered fiscal year (from the end of the prior fiscal year) of any equity awards granted in any prior fiscal year that are outstanding and unvested as of the end of such covered fiscal year |  | 459,668 |  |  | 77,364 |  |  | 142,880 |  |  | 260,498 |
Add the change in fair value (whether positive or negative) as of the vesting date (from the end of the prior fiscal year) of any equity awards granted in any prior fiscal year for which all applicable vesting conditions were satisfied during the covered fiscal year |  | 150,029 |  |  | 153,420 |  |  | 136,315 |  |  | 142,742 |
Subtract the fair value of any equity awards granted in a prior fiscal year that failed to meet the applicable vesting conditions in the covered fiscal year determined as of the end of the prior fiscal year |  | — |  |  | — |  |  | (183,832) |  |  | (105,162) |
Compensation Actually Paid to PEO |  | $6,204,727 |  | $5,741,932 |  | $5,172,954 |  | $4,867,585
In the table above, the unvested equity fair values were calculated on each of the required measurement dates using assumptions based on criteria consistent with those used for grant date fair value calculations and in accordance with the methodology used for financial reporting purposes. For unvested awards subject to performance-based vesting conditions, the fair values were based on the probable outcome of such performance-based vesting conditions as of the last day of the fiscal year. |  |  |
Non-PEO NEO Average Total Compensation Amount | $ 1,467,015 | 1,325,893 | 1,262,377 | 1,306,918
Non-PEO NEO Average Compensation Actually Paid Amount | $ 1,450,940 | 1,373,409 | 1,643,461 | 1,362,313
Adjustment to Non-PEO NEO Compensation Footnote | Amounts reported in this column represent compensation actually paid; adjustments were made to the amounts reported in the Summary Compensation Table for the applicable fiscal year. A reconciliation of the adjustments for the average of the Non-PEO NEOs is set forth in the following table, which describes the adjustments, each of which is prescribed by the SEC rules, to calculate the compensation actually paid amounts from Summary Compensation amounts.
| FY 2024 | FY 2023 | FY 2022 | FY 2021
Average of the Total Compensation for the non-PEO NEOs as reported in the Summary Compensation Table for the covered fiscal year |  | $1,467,015 |  |  | $1,325,893 |  |  | $1,262,377 |  |  | $1,306,918 |
Deduct pension values reported in the “Change in Pension and Nonqualified Deferred Compensation Earnings” column in the Summary Compensation Table for the covered fiscal year |  | (125,997) |  |  | (17,384) |  |  | — |  |  | (49,238) |
Deduct grant date fair value of equity awards reported in the “Stock Awards” column in the Summary Compensation Table for the covered fiscal year |  | (519,216) |  |  | (565,938) |  |  | (629,123) |  |  | (330,688) |
Add actuarial present value of pension value attributable to covered fiscal year’s service |  | 22,898 |  |  | — |  |  | 39,472 |  |  | 28,610 |
Add the entire cost of benefits granted (or credit for benefits reduced) in a plan amendment (or initiation) during the covered fiscal year that are attributed by the benefit formula to services rendered in periods prior to the plan amendment or initiation |  | — |  |  | — |  |  | — |  |  | — |
Add fair values as of the end of the covered fiscal year of all equity awards granted during the covered fiscal year that are outstanding and unvested as of the end of such covered fiscal year |  | 423,195 |  |  | 525,301 |  |  | 644,488 |  |  | 376,578 |
Add fair value as of the vesting date of any awards granted in the covered fiscal year that vested during the covered fiscal year |  | — |  |  | 22,083 |  |  | 274,001 |  |  | — |
Add dividends paid on unvested shares/share units and stock options |  | 54,359 |  |  | 49,061 |  |  | 40,310 |  |  | 35,957 |
Add the change in fair value (whether positive or negative) as of the end of the covered fiscal year (from the end of the prior fiscal year) of any equity awards granted in any prior fiscal year that are outstanding and unvested as of the end of such covered fiscal year |  | 121,204 |  |  | 20,074 |  |  | 29,656 |  |  | 101,993 |
Add the change in fair value (whether positive or negative) as of the vesting date (from the end of the prior fiscal year) of any equity awards granted in any prior fiscal year for which all applicable vesting conditions were satisfied during the covered fiscal year |  | 7,482 |  |  | 14,319 |  |  | 33,625 |  |  | 16,848 |
Subtract the fair value of any equity awards granted in a prior fiscal year that failed to meet the applicable vesting conditions in the covered fiscal year determined as of the end of the prior fiscal year |  | — |  |  | — |  |  | (51,345) |  |  | (124,665) |
Average of the Compensation Actually Paid to non-PEO NEOs |  | $1,450,940 |  |  | $1,373,409 |  |  | $1,643,461 |  |  | $1,362,313 |
In the table above, the unvested equity fair values were calculated on each of the required measurement dates using assumptions based on criteria consistent with those used for grant date fair value calculations and in accordance with the methodology used for financial reporting purposes. For unvested awards subject to performance-based vesting conditions, the fair values were based on the probable outcome of such performance-based vesting conditions as of the last day of the fiscal year. |  |  |
Compensation Actually Paid vs. Total Shareholder Return | Compensation Actually Paid vs. TSR
| Compensation actually paid to the PEO
| Average compensation actually paid to other NEOs
| Total Shareholder Return
| Peer Group Total Shareholder Return
Compensation Actually Paid vs. Net Income | Compensation Actually Paid vs. Net Income
| Compensation actually paid to the PEO
| Average compensation actually paid to other NEOs
| Net Income
Compensation Actually Paid vs. Company Selected Measure | Compensation Actually Paid vs. NFEPS (non-GAAP)
| Compensation actually paid to the PEO
| Average compensation actually paid to other NEOs
| Net Financial Earnings per Share
Total Shareholder Return Vs Peer Group | Compensation Actually Paid vs. TSR
| Compensation actually paid to the PEO
| Average compensation actually paid to other NEOs
| Total Shareholder Return
| Peer Group Total Shareholder Return
Tabular List, Table | 1.NFEPS (non-GAAP) 2.NFE Growth Rate (non-GAAP) 3.Total Shareholder Return 4.CTS |  |  |
Total Shareholder Return Amount | $ 202.03 | 167.33 | 154.17 | 133.89
Peer Group Total Shareholder Return Amount | 153.05 | 107.92 | 116.06 | 109.93
Net Income (Loss) | $ 289,800,000 | $ 264,700,000 | $ 274,900,000 | $ 117,900,000
Company Selected Measure Amount | $ / shares | 2.95 | 2.70 | 2.50 | 2.16
PEO Name | Stephen D. Westhoven | Stephen D. Westhoven | Stephen D. Westhoven | Stephen D. Westhoven
Additional 402(v) Disclosure | Amounts reported in this column represent returns on an initial $100 investment in the S&P 500 Utilities Industry Index, which is used by the Company for purposes of compliance with Item 201(e) of Regulation S-K. Total Shareholder Return is cumulative for the measurement periods beginning on September 30, 2020, and ending on September 30 of each of 2024, 2023, 2022 and 2021, respectively, calculated in accordance with Item 201(e) of Regulation S-K.In accordance with SEC rules, the Company is required to include in the Pay Versus Performance (“PvP”) table the company-selected measure, which is the “most important” financial performance measure (as determined by the Company and that is not otherwise required to be disclosed in the PvP table) used to link compensation actually paid to our named executive officers to Company performance for the most recently completed fiscal year. We determined NFEPS, a non-GAAP financial measure, to be our company-selected measure. NFEPS is the NFE per basic share of Common Stock that the Company reports on a quarterly and annual basis to the public and in its quarterly reports on Form 10-Q and annual report on Form 10-K that are filed with the SEC. For a full discussion of NFEPS and a reconciliation to GAAP earnings per share, please see Appendix A to this Proxy Statement. |  |  |
Measure:: 1 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | NFEPS (non-GAAP) |  |  |
Measure:: 2 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | NFE Growth Rate (non-GAAP) |  |  |
Measure:: 3 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Total Shareholder Return |  |  |
Measure:: 4 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | CTS |  |  |
PEO | Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | $ (1,497,079) | $ (627,726) | $ 0 | $ (782,952)
PEO | Pension Adjustments Service Cost |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 128,658 | 123,925 | 166,246 | 170,574
PEO | Pension Adjustments Prior Service Cost |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 0 | 0 | 0 | 0
PEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (3,266,351) | (2,768,004) | (2,254,623) | (1,822,848)
PEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 2,662,269 | 1,491,710 | 2,356,927 | 2,076,852
PEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 459,668 | 77,364 | 142,880 | 260,498
PEO | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 0 | 1,243,197 | 0 | 0
PEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 150,029 | 153,420 | 136,315 | 142,742
PEO | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 0 | 0 | (183,832) | (105,162)
PEO | Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 359,424 | 264,932 | 196,267 | 144,422
Non-PEO NEO | Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (125,997) | (17,384) | 0 | (49,238)
Non-PEO NEO | Pension Adjustments Service Cost |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 22,898 | 0 | 39,472 | 28,610
Non-PEO NEO | Pension Adjustments Prior Service Cost |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 0 | 0 | 0 | 0
Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (519,216) | (565,938) | (629,123) | (330,688)
Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 423,195 | 525,301 | 644,488 | 376,578
Non-PEO NEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 121,204 | 20,074 | 29,656 | 101,993
Non-PEO NEO | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 0 | 22,083 | 274,001 | 0
Non-PEO NEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 7,482 | 14,319 | 33,625 | 16,848
Non-PEO NEO | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 0 | 0 | (51,345) | (124,665)
Non-PEO NEO | Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | $ 54,359 | $ 49,061 | $ 40,310 | $ 35,957

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