Employee Benefit Plans (Tables)

12 Months Ended

Sep. 30, 2021

Compensation And Retirement Disclosure [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

2021

2020

Pending / Implemented

2021

2020

2019

Surcharge Imposed

Expiration Date of Collective- Bargaining Agreements

New England Teamsters and Trucking Industry Pension Fund

04-6372430 / 001

Red

Red

Yes / Implemented

$

2,563

$

2,659

$

2,468

No

8/31/22 to 4/30/24

Westchester Teamsters Pension Fund

13-6123973 / 001

Green

Green

N/A

1,100

887

1,039

No

1/31/24 to 12/31/24

Local 553 Pension Fund

13-6637826 / 001

Green

Green

N/A

2,841

2,678

3,114

No

12/15/22 to 1/15/23

Local 463 Pension Fund

11-1800729 / 001

Green

Green

N/A

138

138

144

No

6/30/22 to 2/28/23

IAM National Pension Fund

51-6031295 / 002

Red

Red

Yes / Implemented

2,532

2,822

2,296

Yes

1/13/22 to 10/31/23

Teamsters Local 469 Pension Plan

22-6172237 / 001

Red

Red

Yes / Implemented

11

20

26

Yes

8/31/24

Local 445 Pension Fund

13-1864489 / 001

Red

Red

Yes / Implemented

7

5

4

Yes

10/31/24

All Other Multiemployer Pension Plans

411

448

507

Total Contributions

$

9,603

$

9,657

$

9,598

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):

															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 2019
Beginning balance						$	61,924		$	(59,542	)				$	16,273
Interest cost		2,366								(2,366	)
Actual return on plan assets		(9,380	)				9,380
Employer contributions					—		—
Benefit payments							(4,466	)		4,466
Investment and other expenses		(483	)							483
Difference between actual and expected return on plan assets		7,086											(7,086	)
Anticipated expenses		310								(310	)
Actuarial loss										(7,738	)		7,738
Amortization of unrecognized net actuarial loss		1,821											(1,821	)
Annual cost/change	$	1,720		$	—		4,914			(5,465	)	$	(1,169	)		(1,169	)
Ending balance						$	66,838		$	(65,007	)				$	15,104
Funded status at the end of the year									$	1,831
Fiscal Year 2020
Interest cost		1,875								(1,875	)
Actual return on plan assets		(6,538	)				6,538
Employer contributions					—		—
Benefit payments							(4,288	)		4,288
Investment and other expenses		(539	)							539
Difference between actual and expected return on plan assets		4,268											(4,268	)
Anticipated expenses		334								(334	)
Actuarial loss										(3,009	)		3,009
Amortization of unrecognized net actuarial loss		1,617											(1,617	)
Annual cost/change	$	1,017		$	—		2,250			(391	)	$	(2,876	)		(2,876	)
Ending balance						$	69,088		$	(65,398	)				$	12,228
Funded status at the end of the year									$	3,690
Fiscal Year 2021
Interest cost		1,541								(1,541	)
Actual return on plan assets		(678	)				678
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

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	2021	2020	2019
Discount rate at year end date	2.65%	2.45%	3.00%
Expected return on plan assets for the year ended	3.66%	4.36%	4.67%
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,
	2021			2020
			Concentration			Concentration
Asset Category	Level 1		Percentage	Level 1		Percentage
Corporate and U.S. government bond fund (1)	$	59,068	90%	$	62,602	90%
U.S. large-cap equity (1)		4,765	7%		5,006	7%
International equity (1)		1,165	2%		1,158	2%
Cash		339	1%		322	1%
Total	$	65,337	100%	$	69,088	100%

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