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Employee Benefit Plans - Additional Information (Detail) | 12 Months Ended | 21 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 USD ($) Employee Program $ / shares | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2022 USD ($) Employee Program
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 | $ 8,200,000 | $ 7,900,000 |  |
Multiemployer pension plans, coverage of bargaining agreement, percentage |  |  |  |  |  | 45.00%
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 |  | 125,561,000 | 121,221,000 |  |  | $ 125,561,000
Other long-term liabilities |  | 14,766,000 | 25,244,000 |  |  | 14,766,000
Defined benefit plan funded status included in deferred charges and other assets |  | 3,200,000 | $ 4,000,000.0 |  |  | 3,200,000
Net actuarial loss balance in accumulated other comprehensive income to be amortized |  | 11,900,000 |  |  |  | 11,900,000
Amount to be amortized from accumulated other comprehensive income |  | $ 1,500 |  |  |  | 1,500
Discount rate to determine periodic pension expense |  | 5.50% | 2.65% | 2.45% |  |
Expected optional pension contribution |  | $ 0 |  |  |  | 0
Expected benefit payments for year one |  | 3,900,000 |  |  |  | 3,900,000
Expected benefit payments for year two |  | 3,900,000 |  |  |  | 3,900,000
Expected benefit payments for year three |  | 3,900,000 |  |  |  | 3,900,000
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 |  | $ 16,900,000 |  |  |  | $ 16,900,000
Weighted average discount rate |  | 5.50% | 2.65% | 2.45% |  | 5.50%
Cash and Cash Equivalents |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Pension asset allocation |  | 1.00% |  |  |  | 1.00%
Scenario Forecast |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Rate pension plan assets expect to earn | 4.60% |  |  |  |  |
Renewal within Next Fiscal Year |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Multiemployer pension plans, coverage of bargaining agreement, percentage |  | 23.00% |  |  |  |
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 |  | 0.33333% |  |  |  |
Management And General Partner |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Partnership incentive distribution |  | $ 2,055,000 | $ 1,833,000 | $ 1,654,000 |  |
Management Incentive Compensation Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Partnership incentive distribution |  | 1,028,000 | 917,000 | 827,000 |  |
Management Incentive Compensation Plan Executive Officer |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Partnership incentive distribution |  | $ 434,431 | 386,857 | 349,494 |  |
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 | 600,000 | $ 600,000 |  |
New England Teamsters & Trucking Industry Pension Fund |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Multiemployer plan undiscounted withdrawal obligation |  |  |  |  | $ 48,000,000.0 |
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 | 200,000 |  |  | $ 300,000
Other long-term liabilities |  | 16,200,000 | 16,500,000 |  |  | 16,200,000
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 |  | $ 20,200,000 | $ 25,800,000 |  |  | $ 20,200,000
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 | Program |  | 2 |  |  |  | 2
Weighted average discount rate |  | 5.50% | 2.65% |  |  | 5.50%
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 |  | 7.00% |  |  |  | 7.00%
International equity |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Pension asset allocation |  | 2.00% |  |  |  | 2.00%

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