Deferred Compensation Arrangement With Individual Cash Distribution Per Unit

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- Definition

Deferred compensation plan, vesting percentage.

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No definition available.

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- Definition

Defined benefit plan contribution of pension fund in excess of total contribution.

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- Definition

Defined contribution plan employee contribution percentage.

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Defined contribution plan minimum annual contributions per employee amount.

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- Definition

Discount rate to determine periodic pension expense.

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- Definition

Employee benefit payments period.

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- Definition

Gains interest cash proceeds percentage from sale of general partner units.

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- Definition

Green zone multiemployer plans funded percentage.

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- Definition

Incentive distribution percentage of available cash in excess of minimum quarterly distribution.

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- Definition

Multiemployer plans, withdrawal obligation annual installment payment.

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No definition available.

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- Definition

Multiemployer plans, withdrawal undiscounted obligation.

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- Definition

Net actuarial loss balance in accumulated other comprehensive income to be amortized.

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- Definition

Number of defined benefit pension plans.

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- Definition

Number of defined benefit pension plans merged.

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- Definition

Rate pension plan assets expect to earn.

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- Definition

Red zone multiemployer plans funded percentage.

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Yellow zone multiemployer plans funded percentage.

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- Definition

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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Amount of distribution made to individual in accordance with deferred compensation arrangement.

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- Definition

Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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- Definition

Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fifth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fourth fiscal year following current fiscal year.

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Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year.

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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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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No definition available.

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Number of employees eligible to participate in defined contribution plan.

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- Definition

Percentage of entity's employees covered by collective-bargaining arrangement (CBA) to all participants in multiemployer pension plan determined to be individually significant.

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- Definition

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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No definition available.

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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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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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Employee Benefit Plans - Additional Information (Detail)			12 Months Ended
	Sep. 30, 2024 USD ($) Employee Program	Sep. 30, 2023 USD ($)	Sep. 30, 2025	Sep. 30, 2024 USD ($) Employee Program $ / shares	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2015 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum participant contribution				60.00%
Partnership aggregate contributions to defined contribution plans				$ 8,500,000	$ 8,500,000	$ 8,500,000
Multiemployer pension plans, coverage of bargaining agreement, percentage				39.00%
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%
Minimum contribution required				$ 0	$ 0	$ 0
Accrued expenses and other current liabilities	$ 116,317,000	$ 115,606,000		116,317,000	115,606,000
Other long-term liabilities	16,273,000	16,175,000		16,273,000	16,175,000
Defined benefit plan funded status included in deferred charges and other assets	2,700,000	$ 2,700,000		2,700,000	$ 2,700,000
Net actuarial loss balance in accumulated other comprehensive income to be amortized	9,200,000			$ 9,200,000
Discount rate to determine periodic pension expense				4.70%	5.85%	5.50%
Expected optional pension contribution	0			$ 0
Expected benefit payments for year four	3,900,000			3,900,000
Expected benefit payments for year five	3,900,000			3,900,000
Aggregate expected benefit payment for five years thereafter	$ 16,000,000			$ 16,000,000
Weighted average discount rate	4.70%	5.85%		4.70%	5.85%	5.50%
Scenario Forecast
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Rate pension plan assets expect to earn			5.10%
Renewal within Next Fiscal Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Multiemployer pension plans, coverage of bargaining agreement, percentage				12.00%
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				33.33%
Management And General Partner
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Partnership incentive distribution				$ 2,644,000	$ 2,321,000	$ 2,055,000
Management Incentive Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Partnership incentive distribution				1,322,000	1,160,000	1,028,000
Management Incentive Compensation Plan Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Partnership incentive distribution				$ 558,867	490,485	434,431
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				$ 500,000	500,000	$ 500,000
New England Teamsters & Trucking Industry Pension Fund
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Multiemployer plan undiscounted withdrawal obligation							$ 48,000,000
Expected benefit payments in years							30 years
Multiemployer plan annual liability annual payment amount							$ 1,600,000
Accrued expenses and other current liabilities	$ 300,000	$ 300,000		300,000	300,000
Other long-term liabilities	15,700,000	16,000,000		15,700,000	16,000,000
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	$ 19,300,000	$ 18,500,000		$ 19,300,000	$ 18,500,000
New England Teamsters & Trucking Industry Pension Fund \| Multiemployer Pension Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum funded for red zone				65.00%
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 merged \| Program	2			2
Number of frozen defined benefit pension plans \| Program	1			1
Discount rate to determine periodic pension expense	4.70%	5.85%
Domestic Fixed Income
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pension asset allocation	90.00%			90.00%
Domestic Equities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pension asset allocation	10.00%			10.00%