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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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Defined Benefit Plan, Employee Contribution, Percentage

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

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from employee benefits, classified as other.

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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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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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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.

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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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Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

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

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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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Amount of liabilities classified as other, due 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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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%