Employee Benefit Plans (Tables)

12 Months Ended

Sep. 30, 2023

Retirement Benefits [Abstract]

Participation and Contributions to Multiemployer Pension Plans

Pension Protection Act Zone Status

FIP / RP Status

Company Contributions (in thousands)

Pension Fund

EIN / Pension Plan Number

2023

2022

Pending / Implemented

2023

2022

2021

Surcharge Imposed

Expiration Date of Collective- Bargaining Agreements

New England Teamsters and Trucking Industry Pension Fund

04-6372430/ 001

Red

Red

Yes / Implemented

2,721

2,605

2,563

No

4/30/24 to 4/30/28

Westchester Teamsters Pension Fund

13-6123973/ 001

Green

Green

N/A

964

1,153

1,100

No

1/31/24 to 12/31/24

Local 553 Pension Fund

13-6637826/ 001

Green

Green

N/A

2,516

2,741

2,841

No

12/15/25 to 1/15/26

Local 463 Pension Fund

11-1800729/ 001

Green

Green

N/A

125

133

138

No

6/30/25 to 2/28/26

IAM National Pension Fund

51-6031295/ 002

Red

Red

Yes / Implemented

2,477

2,585

2,532

Yes

10/31/23 to 6/30/26

Teamsters Local 469 Pension Plan

22-6172237 / 001

Red

Red

Yes / Implemented

18

21

11

Yes

8/31/2024

Local 445 Pension Fund

13-1864489/ 001

Red

Red

Yes / Implemented

9

8

7

Yes

10/31/2024

All Other Multiemployer Pension Plans

481

391

411

Total Contributions

$

9,311

$

9,637

$

9,603

Net Periodic Benefit Cost for Period Reconciliation of Changes in Plan Assets Projected Benefit Obligations and Amounts Recognized in Other Comprehensive Income and Accumulated Other Comprehensive Income

The following table provides the net periodic benefit cost for the period, a reconciliation of the changes in the Plan assets, projected benefit obligations, and the amounts recognized in other comprehensive income and accumulated other comprehensive income at the dates indicated using a measurement date of September 30 (in thousands). Certain amounts in the table have been reclassified to conform with current year presentation.

																Gross Pension
	Net Periodic						Fair									Related
	Pension						Value of									Accumulated
	Cost in						Pension			Projected			Other			Other
	Income						Plan			Benefit			Comprehensive			Comprehensive
Debit / (Credit)	Statement			Cash			Assets			Obligation			(Income) / Loss			Income
Fiscal Year 2021
Beginning balance							$	69,088		$	(65,398	)				$	12,228
Funded status at the end of the year										$	3,690
Interest cost		1,541									(1,541	)
Actual return on plan assets		(1,055	)					1,055
Employer contributions					—			—
Benefit payments								(4,429	)		4,429
Investment and other expenses								(377	)		377
Difference between actual and expected return on plan assets		(1,386	)											1,386
Anticipated expenses		345									(345	)
Actuarial gain											1,184			(1,184	)
Amortization of unrecognized net actuarial loss		937												(937	)
Annual cost/change	$	382		$	—			(3,751	)		4,104		$	(735	)		(735	)
Ending balance							$	65,337		$	(61,294	)				$	11,493
Funded status at the end of the year										$	4,043
Fiscal Year 2022
Interest cost		1,560									(1,560	)
Actual return on plan assets		13,151						(13,151	)
Employer contributions					—			—
Benefit payments								(4,225	)		4,225
Investment and other expenses								(507	)		507
Difference between actual and expected return on plan assets		(15,200	)											15,200
Anticipated expenses		—									—
Actuarial gain											13,869			(13,869	)
Amortization of unrecognized net actuarial loss		896												(896	)
Annual cost/change	$	407		$	—			(17,883	)		17,041		$	435			435
Ending balance							$	47,454		$	(44,253	)				$	11,928
Funded status at the end of the year										$	3,201
Fiscal Year 2023
Interest cost		2,312									(2,312	)
Actual return on plan assets		(1,196	)					1,196
Employer contributions					(64	)		64
Benefit payments								(3,936	)		3,936
Investment and other expenses								(572	)		572
Difference between actual and expected return on plan assets		(635	)											635
Anticipated expenses		—									—
Actuarial gain											572			(572	)
Amortization of unrecognized net actuarial loss		1,526												(1,526	)
Annual cost/change	$	2,007		$	(64	)		(3,248	)		2,768		$	(1,463	)		(1,463	)
Ending balance							$	44,206		$	(41,485	)				$	10,465
Funded status at the end of the year										$	2,721

Weighted-Average Assumptions Used in Measurement of Partnership's Benefit Obligation

	September 30,
Weighted-Average Assumptions Used in the Measurement of the Company’s Benefit Obligation	2023	2022	2021
Discount rate at year end date	5.85%	5.50%	2.65%
Expected return on plan assets for the year ended	4.56%	3.77%	3.66%
Rate of compensation increase	N/A	N/A	N/A

Fair Values and Percentage of Company's Pension Plan Assets by Asset Category

The fair values and percentage of the Company’s pension plan assets by asset category are as follows (in thousands):

	September 30,
	2023			2022
			Concentration			Concentration
Asset Category	Level 1		Percentage	Level 1		Percentage
Corporate and U.S. government bond fund (1)	$	39,852	90%	$	42,921	90%
U.S. large-cap equity (1)		3,244	7%		3,411	7%
International equity (1)		808	2%		817	2%
Cash		302	1%		305	1%
Total	$	44,206	100%	$	47,454	100%

Represent investments in Vanguard funds that seek to replicate the asset category description.