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Employee Benefit Plans - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) Employee | Sep. 30, 2016 USD ($) Program $ / shares | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2013 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum participant contribution |  |  | 60.00% |  |  |
Partnership aggregate contributions to defined contribution plans |  |  | $ 6,000,000 | $ 5,700,000 | $ 5,200,000 |
Multiemployer pension plans, coverage of bargaining agreement, percentage |  |  | 41.00% |  |  |
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% | 3.30% | 4.05% | 4.05% |
Accrued expenses and other current liabilities | $ 107,745,000 | $ 107,745,000 | $ 103,855,000 | $ 107,745,000 |  |
Other long-term liabilities | 27,110,000 | 27,110,000 | 25,255,000 | 27,110,000 |  |
Defined benefit plan funded status included in other long-term liabilities | 3,300,000 | 3,300,000 | 2,400,000 | $ 3,300,000 |  |
Net actuarial loss balance in accumulated other comprehensive income to be amortized |  |  | 21,700,000 |  |  |
Amount to be amortized from accumulated other comprehensive income |  |  | $ 2,100,000 |  |  |
Rate pension plan assets expect to earn |  |  | 4.80% |  |  |
Discount rate to determine periodic pension expense |  |  | 3.30% | 4.05% | 4.45% |
Expected optional pension contribution |  |  | $ 2,000,000 |  |  |
Expected benefit payments over the next 5 years |  |  | 4,600,000 |  |  |
Aggregate expected benefit payment for five years thereafter |  |  | 20,000,000 |  |  |
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 |  |  | 17.00% |  |  |
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 | 605,000 | 605,000 | $ 795,000 | $ 605,000 | $ 447,000 |
Management Incentive Compensation Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Partnership incentive distribution | 302,000 | 302,000 | 397,000 | 302,000 | 223,000 |
Management Incentive Compensation Plan Executive Officer |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Partnership incentive distribution | 135,000 | $ 135,000 | $ 177,034 | 135,000 | 100,000 |
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 |  |  | 17,500,000 |  |  |
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 |  |  | $ 20,700,000 |  |  |
New England Teamsters & Trucking Industry Pension Fund | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of employees | Employee |  | 200 |  |  |  |
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 | $ 68,276,000 | 63,788,000 | 65,379,000 | $ 60,028,000
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 | $ 600,000 | $ 500,000 |
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 |  |  | 15.00% |  |  |
Domestic Equities |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Pension asset allocation |  |  | 5.00% |  |  |

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- Definition This represents the noncurrent liability recognized in the balance sheet that is associated with the defined benefit pension plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2417-114920 + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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