Employee Benefit Plans (Tables)

12 Months Ended

Sep. 30, 2020

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

2020

2019

Pending / Implemented

2020

2019

2018

Surcharge Imposed

Expiration Date of Collective- Bargaining Agreements

New England Teamsters and Trucking Industry Pension Fund

04-6372430 / 001

Red

Red

Yes / Implemented

$

2,659

$

2,468

$

2,455

No

4/30/21 to 4/30/23

Westchester Teamsters Pension Fund

13-6123973 / 001

Green

Green

N/A

887

1,039

846

No

1/31/24 to 12/31/24

Local 553 Pension Fund

13-6637826 / 001

Green

Green

N/A

2,678

3,114

2,888

No

12/15/22 to 1/15/23

Local 463 Pension Fund

11-1800729 / 001

Green

Green

N/A

138

144

145

No

6/30/22 to 2/28/23

IAM National Pension Fund

51-6031295 / 002

Red

Red

Yes / Implemented

2,822

2,296

2,320

Yes

12/31/20 to 7/01/23

Teamsters Local 469 Pension Plan

22-6172237 / 001

Red

Red

Yes / Implemented

20

26

46

Yes

8/31/21

Local 445 Pension Fund

13-1864489 / 001

Red

Red

Yes / Implemented

5

4

4

Yes

10/31/21

All Other Multiemployer Pension Plans

448

507

437

Total Contributions

$

9,657

$

9,598

$

9,141

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 2018
Beginning balance							$	65,676		$	(65,781	)				$	18,348
Interest cost		2,279									(2,279	)
Actual return on plan assets		942						(942	)
Employer contributions					(1,653	)		1,653
Benefit payments								(4,463	)		4,463
Investment and other expenses		(394	)								394
Difference between actual and expected return on plan assets		(3,705	)											3,705
Anticipated expenses		328									(328	)
Actuarial loss											3,989			(3,989	)
Amortization of unrecognized net actuarial loss		1,791												(1,791	)
Annual cost/change	$	1,241		$	(1,653	)		(3,752	)		6,239		$	(2,075	)		(2,075	)
Ending balance							$	61,924		$	(59,542	)				$	16,273
Funded status at the end of the year										$	2,382
Fiscal Year 2019
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

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	2020	2019	2018
Discount rate at year end date	2.45%	3.00%	4.15%
Expected return on plan assets for the year ended	4.36%	4.67%	4.86%
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,
	2020			2019
			Concentration			Concentration
Asset Category	Level 1		Percentage	Level 1		Percentage
Corporate and U.S. government bond fund (1)	$	62,602	90%	$	60,720	90%
U.S. large-cap equity (1)		5,006	7%		4,632	7%
International equity (1)		1,158	2%		1,119	2%
Cash		322	1%		367	1%
Total	$	69,088	100%	$	66,838	100%

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