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Employee Benefit Plans - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
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Sep. 30, 2015 USD ($) Employee | Sep. 30, 2019 | Sep. 30, 2018 USD ($) Program $ / shares | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum participant contribution |  |  | 60.00% |  |  |
Partnership aggregate contributions to defined contribution plans |  |  | $ 6,700,000 | $ 6,300,000 | $ 6,000,000 |
Multiemployer pension plans, coverage of bargaining agreement, percentage |  |  | 43.00% |  |  |
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% |
Accrued expenses and other current liabilities |  |  | $ 116,436,000 | $ 108,449,000 |  |
Other long-term liabilities |  |  | 24,012,000 | 23,659,000 |  |
Defined benefit plan funded status included in deferred charges and other assets |  |  | 2,400,000 |  |  |
Defined benefit plan funded status included in other long-term liabilities |  |  |  | $ 100,000 |  |
Net actuarial loss balance in accumulated other comprehensive income to be amortized |  |  | 16,300,000 |  |  |
Amount to be amortized from accumulated other comprehensive income |  |  | $ 1,800,000 |  |  |
Discount rate to determine periodic pension expense |  |  | 4.15% | 3.60% | 3.30% |
Expected optional pension contribution |  |  | $ 0 |  |  |
Expected benefit payments for year one |  |  | 4,400,000 |  |  |
Expected benefit payments for year two |  |  | 4,400,000 |  |  |
Expected benefit payments for year three |  |  | 4,400,000 |  |  |
Expected benefit payments for year four |  |  | 4,400,000 |  |  |
Expected benefit payments for year five |  |  | 4,400,000 |  |  |
Aggregate expected benefit payment for five years thereafter |  |  | $ 19,000,000 |  |  |
Cash and Cash Equivalents |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Pension asset allocation |  |  | 1.00% |  |  |
Scenario forecast |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Rate pension plan assets expect to earn |  | 4.70% |  |  |  |
Renewal within Next Fiscal Year |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Multiemployer pension plans, coverage of bargaining agreement, percentage |  |  | 9.00% |  |  |
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 |  |  | 33.333% |  |  |
Management And General Partner |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Partnership incentive distribution |  |  | $ 1,199,000 | $ 963,000 | $ 795,000 |
Management Incentive Compensation Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Partnership incentive distribution |  |  | 600,000 | 481,000 | 397,000 |
Management Incentive Compensation Plan Executive Officer |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Partnership incentive distribution |  |  | $ 267,082 | 214,378 | 177,034 |
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 |  |  | $ 600,000 | $ 700,000 | $ 700,000 |
New England Teamsters & Trucking Industry Pension Fund |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum funded for red zone | 65.00% |  |  |  |  |
Multiemployer plan undiscounted withdrawal obligation | $ 48,000,000 |  |  |  |  | $ 48,000,000
Expected benefit payments in years |  |  |  |  |  | 30 years
Multiemployer plan annual liability annual payment amount | $ 1,600,000 |  |  |  |  | $ 1,600,000
Accrued expenses and other current liabilities |  |  | 200,000 |  |  |
Other long-term liabilities |  |  | 17,100,000 |  |  |
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 |  |  | $ 21,400,000 |  |  |
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 |  |  |
Domestic Fixed Income |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Pension asset allocation |  |  | 90.00% |  |  |
Domestic Equities |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Pension asset allocation |  |  | 7.00% |  |  |
International equity |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Pension asset allocation |  |  | 2.00% |  |  |

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