Deferred Compensation Arrangement With Individual Cash Distribution Per Unit

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Deferred Compensation Plan, Vesting Percentage

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- Definition

Defined Benefit Plan Contribution Of Pension Fund In Excess Of Total Contribution

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- Definition

Defined Benefit Plan, Employee Contribution, Percentage

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- Definition

Defined Benefit Plan, Expected Future Benefit Payments in Years One Through Five

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Discount Rate To Determine Periodic Pension Expense

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Employee Benefit Payments Period

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- Definition

Gains Interest Cash Proceeds Percentage From Sale Of General Partner Units

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Green Zone Multiemployer Plans Funded Percentage

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Incentive Distribution Percentage Of Available Cash In Excess Of Minimum Quarterly Distribution

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Multiemployer Plans, Withdrawal Obligation Annual After Tax Cash Impact

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Multiemployer Plans, Withdrawal Obligation Annual Installment Payment

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Multiemployer Plans, Withdrawal Undiscounted Obligation

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Net Actuarial Loss Balance In Accumulated Other Comprehensive Income To Be Amortized

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Number of Defined Benefit Pension Plans

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Rate Pension Plan Assets Expect To Earn

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Red Zone Multiemployer Plans Funded Percentage

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Yellow Zone Multiemployer Plans Funded Percentage

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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The amount of distributions made to the individual during the period.

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No definition available.

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- Definition

The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from employee benefit costs not otherwise specified in the taxonomy, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

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- Definition

This represents the noncurrent liability recognized in the balance sheet that is associated with the defined benefit pension plans.

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Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation).

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No definition available.

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- Definition

The interest rate used to adjust for the time value of money for the plan.

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Amount of benefits from a defined benefit plan expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

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No definition available.

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Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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Number of employees eligible to participate in the defined contribution plan or plans described.

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Percentage of employee participants subject to a collective bargaining arrangement to all participants in a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

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Amount of the obligation recognized by withdrawing from a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

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Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer).

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The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Employee Benefit Plans - Additional Information (Detail)	1 Months Ended	3 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($) Program	Sep. 30, 2015 USD ($) Program Employee	Sep. 30, 2015 USD ($) Program $ / shares	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2012 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum participant contribution			60.00%
Partnership aggregate contributions to defined contribution plans			$ 5,700,000	$ 5,200,000	$ 4,900,000
Multiemployer pension plans, coverage of bargaining agreement, percentage	40.00%	40.00%	40.00%
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%
Expected benefit payments in years			5 years
Payment obligation discount rate	4.05%	4.05%	4.05%	4.05%	4.45%
Accrued expenses and other current liabilities	$ 107,745,000	$ 107,745,000	$ 107,745,000	$ 102,934,000
Other long-term liabilities	27,110,000	27,110,000	27,110,000	8,677,000
Defined benefit plan funded status included in other long-term liabilities	3,300,000	3,300,000	3,300,000	$ 5,100,000
Net actuarial loss balance in accumulated other comprehensive income to be amortized	24,800,000	24,800,000	24,800,000
Amount to be amortized from accumulated other comprehensive income			$ 2,600,000
Rate pension plan assets expect to earn			5.50%
Discount rate to determine periodic pension expense			4.05%	4.45%	3.50%
Expected benefit payments over the next 5 years	4,500,000	4,500,000	$ 4,500,000
Aggregate expected benefit payment for five years thereafter	20,500,000	20,500,000	20,500,000
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	0	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	$ 0	$ 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	9.00%	9.00%	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%
Management \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Quarterly distribution \| $ / shares			$ 0.0675
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	$ 605,000	$ 447,000	$ 330,000
Management Incentive Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Partnership incentive distribution	302,000	302,000	302,000	223,000	165,000
Management Incentive Compensation Plan Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Partnership incentive distribution	135,000	$ 135,000	135,000	100,000	119,000
Other Postretirement Benefit Plan, Defined Benefit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Partnership aggregate contributions to defined contribution plans			600,000	500,000	500,000
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	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	100,000	100,000	100,000
Other long-term liabilities	17,600,000	17,600,000	17,600,000
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	$ 16,700,000	$ 16,700,000	$ 16,700,000
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	2	2
Fair values of the Partnership's pension plan assets	$ 63,788,000	$ 63,788,000	$ 63,788,000	$ 65,379,000	$ 60,028,000	$ 60,303,000
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%