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Employee Benefit Plans - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
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Sep. 30, 2015 USD ($) Employee | Sep. 30, 2015 USD ($) Employee | Sep. 30, 2018 | Sep. 30, 2017 USD ($) Program $ / shares | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) Employee | Sep. 30, 2014 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Maximum participant contribution |  |  |  | 60.00% |  |  |
Partnership aggregate contributions to defined contribution plans |  |  |  | $ 6,300,000 | $ 6,000,000 | $ 5,700,000 |
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 0% of the plan's total contributions in percentage |  |  |  | 5.00% | 5.00% | 5.00% |
Expected benefit payments in years |  |  |  | 5 years |  |  |
Payment obligation discount rate | 4.05% | 4.05% |  | 3.60% | 3.30% | 4.05% |
Accrued expenses and other current liabilities |  |  |  | $ 108,449,000 | $ 103,855,000 |  |
Other long-term liabilities |  |  |  | 23,659,000 | 25,255,000 |  |
Defined benefit plan funded status included in other long-term liabilities |  |  |  | 100,000 | $ 2,400,000 |  |
Net actuarial loss balance in accumulated other comprehensive income to be amortized |  |  |  | 18,300,000 |  |  |
Amount to be amortized from accumulated other comprehensive income |  |  |  | $ 1,800,000 |  |  |
Discount rate to determine periodic pension expense |  |  |  | 3.60% | 3.30% | 4.05% |
Expected optional pension contribution |  |  |  | $ 2,000,000 |  |  |
Expected benefit payments over the next 5 years |  |  |  | 4,500,000 |  |  |
Aggregate expected benefit payment for five years thereafter |  |  |  | 19,600,000 |  |  |
Scenario, Forecast |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Rate pension plan assets expect to earn |  |  | 4.90% |  |  |  |
Significant Other Observable Inputs Level 2 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Fair values of the Partnership's pension plan assets |  |  |  | 0 |  |  |
Significant Unobservable Inputs Level 3 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Fair values of the Partnership's pension plan assets |  |  |  | $ 0 |  |  |
Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Participant Contribution |  |  |  | 0.00% |  |  |
Renewal within Next Fiscal Year |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Multiemployer pension plans, coverage of bargaining agreement, percentage |  |  |  | 11.00% |  |  |
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 |  |  |  | $ 963,000 | $ 795,000 | $ 605,000 |
Management Incentive Compensation Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Partnership incentive distribution |  |  |  | 481,000 | 397,000 | 302,000 |
Management Incentive Compensation Plan Executive Officer |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Partnership incentive distribution |  |  |  | $ 214,378 | 177,034 | 135,000 |
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% |  |  |
Management | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Quarterly distribution | $ / shares |  |  |  | $ 0.0675 |  |  |
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 |  |  |  | 48,000,000 |
Expected benefit payments in years | 30 years |  |  |  |  |  |
Multiemployer plan annual liability annual payment amount | $ 1,600,000 | 1,600,000 |  |  |  | 1,600,000 |
Multiemployer plan annual after tax cash impact on agreement | 900,000 | 900,000 |  |  |  | 900,000 |
Multiemployer plan discounted withdrawal liability | $ 17,800,000 | $ 17,800,000 |  |  |  | $ 17,800,000 |
Payment obligation discount rate | 8.22% | 8.22% |  |  |  | 8.22% |
Multiemployer plan non-cash deferred tax benefit | $ 7,000,000 | $ 7,000,000 |  |  |  | $ 7,000,000 |
Net non-cash pension charge |  | $ 10,800,000 |  |  |  |  |
Accrued expenses and other current liabilities |  |  |  | $ 200,000 |  |  |
Other long-term liabilities |  |  |  | 17,300,000 |  |  |
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 |  |  |  | $ 22,700,000 |  |  |
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 |  |  |  | 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 |  |  |
Fair values of the Partnership's pension plan assets | $ 63,788,000 | $ 63,788,000 |  | $ 65,676,000 | 68,276,000 | $ 63,788,000 | $ 65,379,000
Other Postretirement Benefit Plan, Defined Benefit |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Partnership aggregate contributions to defined contribution plans |  |  |  | $ 700,000 | $ 700,000 | $ 600,000 |
Domestic Fixed Income |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Pension asset allocation |  |  |  | 80.00% |  |  |
International equity |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Pension asset allocation |  |  |  | 5.00% |  |  |
Domestic Equities |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Pension asset allocation |  |  |  | 15.00% |  |  |

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