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Employee Benefit Plans - Additional Information (Detail) |  |  | 12 Months Ended
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Sep. 30, 2024 USD ($) Employee Program | Sep. 30, 2023 USD ($) | Sep. 30, 2025 | Sep. 30, 2024 USD ($) Employee Program $ / shares | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2015 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Maximum participant contribution |  |  |  | 60.00% |  |  |
Partnership aggregate contributions to defined contribution plans |  |  |  | $ 8,500,000 | $ 8,500,000 | $ 8,500,000 |
Multiemployer pension plans, coverage of bargaining agreement, percentage |  |  |  | 39.00% |  |  |
Maximum funded for red zone |  |  |  | 65.00% |  |  |
Maximum funded for yellow zone |  |  |  | 80.00% |  |  |
Minimum funded for green zone |  |  |  | 80.00% |  |  |
Partnership contributions in excess of 5% of the plan's total contributions in percentage |  |  |  | 5.00% | 5.00% | 5.00% |
Minimum contribution required |  |  |  | $ 0 | $ 0 | $ 0 |
Accrued expenses and other current liabilities | $ 116,317,000 | $ 115,606,000 |  | 116,317,000 | 115,606,000 |  |
Other long-term liabilities | 16,273,000 | 16,175,000 |  | 16,273,000 | 16,175,000 |  |
Defined benefit plan funded status included in deferred charges and other assets | 2,700,000 | $ 2,700,000 |  | 2,700,000 | $ 2,700,000 |  |
Net actuarial loss balance in accumulated other comprehensive income to be amortized | 9,200,000 |  |  | $ 9,200,000 |  |  |
Discount rate to determine periodic pension expense |  |  |  | 4.70% | 5.85% | 5.50% |
Expected optional pension contribution | 0 |  |  | $ 0 |  |  |
Expected benefit payments for year four | 3,900,000 |  |  | 3,900,000 |  |  |
Expected benefit payments for year five | 3,900,000 |  |  | 3,900,000 |  |  |
Aggregate expected benefit payment for five years thereafter | $ 16,000,000 |  |  | $ 16,000,000 |  |  |
Weighted average discount rate | 4.70% | 5.85% |  | 4.70% | 5.85% | 5.50% |
Scenario Forecast |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Rate pension plan assets expect to earn |  |  | 5.10% |  |  |  |
Renewal within Next Fiscal Year |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Multiemployer pension plans, coverage of bargaining agreement, percentage |  |  |  | 12.00% |  |  |
Management |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Incentive distribution percentage of available cash in excess of minimum quarterly distribution |  |  |  | 50.00% |  |  |
Gains interest cash proceeds percentage from the sale of general partner units |  |  |  | 50.00% |  |  |
Employee and Consultant |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Participant's vested percentage of plan benefits |  |  |  | 100.00% |  |  |
Termination of employment or consultation |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Participant's vested percentage of plan benefits |  |  |  | 20.00% |  |  |
Chief executive officer |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Participant's vested percentage of plan benefits |  |  |  | 33.33% |  |  |
Management And General Partner |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Partnership incentive distribution |  |  |  | $ 2,644,000 | $ 2,321,000 | $ 2,055,000 |
Management Incentive Compensation Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Partnership incentive distribution |  |  |  | 1,322,000 | 1,160,000 | 1,028,000 |
Management Incentive Compensation Plan Executive Officer |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Partnership incentive distribution |  |  |  | $ 558,867 | 490,485 | 434,431 |
Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Participant Contribution |  |  |  | 0.00% |  |  |
Minimum | Management |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Quarterly distribution | $ / shares |  |  |  | $ 0.0675 |  |  |
Other Postretirement Benefit Plan, Defined Benefit |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Partnership aggregate contributions to defined contribution plans |  |  |  | $ 500,000 | 500,000 | $ 500,000 |
New England Teamsters & Trucking Industry Pension Fund |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Multiemployer plan undiscounted withdrawal obligation |  |  |  |  |  |  | $ 48,000,000
Expected benefit payments in years |  |  |  |  |  |  | 30 years
Multiemployer plan annual liability annual payment amount |  |  |  |  |  |  | $ 1,600,000
Accrued expenses and other current liabilities | $ 300,000 | $ 300,000 |  | 300,000 | 300,000 |  |
Other long-term liabilities | 15,700,000 | 16,000,000 |  | 15,700,000 | 16,000,000 |  |
New England Teamsters & Trucking Industry Pension Fund | Significant Other Observable Inputs Level 2 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Multiemployer plan discounted withdrawal liability | $ 19,300,000 | $ 18,500,000 |  | $ 19,300,000 | $ 18,500,000 |  |
New England Teamsters & Trucking Industry Pension Fund | Multiemployer Pension Plans |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Maximum funded for red zone |  |  |  | 65.00% |  |  |
New England Teamsters & Trucking Industry Pension Fund | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of employees | Employee | 200 |  |  | 200 |  |  |
Frozen Defined Benefit Pension Plans |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of frozen defined benefit pension plans merged | Program | 2 |  |  | 2 |  |  |
Number of frozen defined benefit pension plans | Program | 1 |  |  | 1 |  |  |
Discount rate to determine periodic pension expense | 4.70% | 5.85% |  |  |  |  |
Domestic Fixed Income |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Pension asset allocation | 90.00% |  |  | 90.00% |  |  |
Domestic Equities |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Pension asset allocation | 10.00% |  |  | 10.00% |  |  |

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