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v3.23.1

CONDENSED CONSOLIDATED STATEMENT OF PARTNERS' CAPITAL - USD ($) shares in Thousands, $ in Thousands | Total | General Partner | Common Stock | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | ---
Beginning Balance at Sep. 30, 2021 | $ 278,204 | $ (2,821) | $ 295,063 | $ (14,038)
Beginning Balance, unit at Sep. 30, 2021 |  | 326 | 39,046 |
Net income | 95,868 | $ 819 | $ 95,049 |
Unrealized gain on pension plan obligation | 448 |  |  | 448
Tax effect of unrealized gain on pension plan obligation | (106) |  |  | (106)
Unrealized gain (loss) on captive insurance collateral | (2,674) |  |  | (2,674)
Tax effect of unrealized gain (loss) on captive insurance collateral | 564 |  |  | 564
Unrealized gain (loss) on interest rate hedges | 2,267 |  |  | 2,267
Tax effect of unrealized gain (loss) on interest rate hedges | (603) |  |  | (603)
Distributions | (11,432) | (522) | (10,910) |
Retirement of units | (22,182) |  | $ (22,182) |
Retirement of units, shares |  |  | (2,096) |
Ending Balance at Mar. 31, 2022 | 340,354 | $ (2,524) | $ 357,020 | (14,142)
Ending Balance, Unit at Mar. 31, 2022 |  | 326 | 36,950 |
Beginning Balance at Dec. 31, 2021 | 275,359 | $ (2,963) | $ 292,139 | (13,817)
Beginning Balance, unit at Dec. 31, 2021 |  | 326 | 37,942 |
Net income | 81,379 | $ 697 | $ 80,682 |
Unrealized gain on pension plan obligation | 224 |  |  | 224
Tax effect of unrealized gain on pension plan obligation | (61) |  |  | (61)
Unrealized gain (loss) on captive insurance collateral | (2,062) |  |  | (2,062)
Tax effect of unrealized gain (loss) on captive insurance collateral | 435 |  |  | 435
Unrealized gain (loss) on interest rate hedges | 1,549 |  |  | 1,549
Tax effect of unrealized gain (loss) on interest rate hedges | (410) |  |  | (410)
Distributions | (5,642) | (258) | (5,384) |
Retirement of units | (10,417) |  | $ (10,417) |
Retirement of units, shares |  |  | (992) |
Ending Balance at Mar. 31, 2022 | 340,354 | $ (2,524) | $ 357,020 | (14,142)
Ending Balance, Unit at Mar. 31, 2022 |  | 326 | 36,950 |
Beginning Balance at Sep. 30, 2022 | 257,915 | $ (3,656) | $ 277,177 | (15,606)
Beginning Balance, unit at Sep. 30, 2022 |  | 326 | 36,092 |
Ending Balance at Dec. 31, 2022 | 262,373 | $ (3,826) | $ 281,516 | (15,317)
Ending Balance, Unit at Dec. 31, 2022 |  | 326 | 35,681 |
Beginning Balance at Sep. 30, 2022 | 257,915 | $ (3,656) | $ 277,177 | (15,606)
Beginning Balance, unit at Sep. 30, 2022 |  | 326 | 36,092 |
Net income | 75,580 | $ 684 | $ 74,896 |
Unrealized gain on pension plan obligation | 762 |  |  | 762
Tax effect of unrealized gain on pension plan obligation | (201) |  |  | (201)
Unrealized gain (loss) on captive insurance collateral | 1,130 |  |  | 1,130
Tax effect of unrealized gain (loss) on captive insurance collateral | (238) |  |  | (238)
Unrealized gain (loss) on interest rate hedges | (1,081) |  |  | (1,081)
Tax effect of unrealized gain (loss) on interest rate hedges | 288 |  |  | 288
Distributions | (11,505) | (581) | (10,924) |
Retirement of units | (4,475) |  | $ (4,475) |
Retirement of units, shares |  |  | (489) |
Ending Balance at Mar. 31, 2023 | 318,175 | $ (3,553) | $ 336,674 | (14,946)
Ending Balance, Unit at Mar. 31, 2023 |  | 326 | 35,603 |
Beginning Balance at Dec. 31, 2022 | 262,373 | $ (3,826) | $ 281,516 | (15,317)
Beginning Balance, unit at Dec. 31, 2022 |  | 326 | 35,681 |
Net income | 62,041 | $ 562 | $ 61,479 |
Unrealized gain on pension plan obligation | 382 |  |  | 382
Tax effect of unrealized gain on pension plan obligation | (104) |  |  | (104)
Unrealized gain (loss) on captive insurance collateral | 775 |  |  | 775
Tax effect of unrealized gain (loss) on captive insurance collateral | (164) |  |  | (164)
Unrealized gain (loss) on interest rate hedges | (704) |  |  | (704)
Tax effect of unrealized gain (loss) on interest rate hedges | 186 |  |  | 186
Distributions | (5,731) | (289) | (5,442) |
Retirement of units | (879) |  | $ (879) |
Retirement of units, shares |  |  | (78) |
Ending Balance at Mar. 31, 2023 | $ 318,175 | $ (3,553) | $ 336,674 | $ (14,946)
Ending Balance, Unit at Mar. 31, 2023 |  | 326 | 35,603 |

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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21463-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration