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Employee Benefit Plans (Tables) | 12 Months Ended
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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.

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