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Participation and Contributions to Multi Employer Pension Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Multiemployer Plans [Line Items]
Partnership Contributions	$ 9,598	$ 9,141	$ 8,940
New England Teamsters & Trucking Industry Pension Fund
Multiemployer Plans [Line Items]
EIN	046372430
Pension Plan Number	001
Pension Protection Act Zone Status	Red	Red
FIP / RP Status Pending / Implemented	Implemented
Partnership Contributions	$ 2,468	$ 2,455	2,621
Surcharge Imposed	No
Expiration Date of Collective-Bargaining Agreements, Start Date	Mar. 31, 2020
Expiration Date of Collective-Bargaining Agreements, End Date	Apr. 30, 2023
Westchester Teamsters Pension Fund
Multiemployer Plans [Line Items]
EIN	136123973
Pension Plan Number	001
Pension Protection Act Zone Status	Green	Green
FIP / RP Status Pending / Implemented	NA
Partnership Contributions	$ 1,039	$ 846	924
Surcharge Imposed	No
Expiration Date of Collective-Bargaining Agreements, Start Date	Dec. 31, 2019
Expiration Date of Collective-Bargaining Agreements, End Date	Jan. 31, 2024
Local 553 Pension Fund
Multiemployer Plans [Line Items]
EIN	136637826
Pension Plan Number	001
Pension Protection Act Zone Status	Green	Green
FIP / RP Status Pending / Implemented	NA
Partnership Contributions	$ 3,114	$ 2,888	2,780
Surcharge Imposed	No
Expiration Date of Collective-Bargaining Agreements, Start Date	Dec. 15, 2019
Expiration Date of Collective-Bargaining Agreements, End Date	Jan. 15, 2020
Local 463 Pension Fund
Multiemployer Plans [Line Items]
EIN	111800729
Pension Plan Number	001
Pension Protection Act Zone Status	Green	Green
FIP / RP Status Pending / Implemented	NA
Partnership Contributions	$ 144	$ 145	150
Surcharge Imposed	No
Expiration Date of Collective-Bargaining Agreements, Start Date	Feb. 28, 2020
Expiration Date of Collective-Bargaining Agreements, End Date	Jun. 30, 2022
All Other Multiemployer Pension Plans
Multiemployer Plans [Line Items]
Partnership Contributions	$ 2,833	$ 2,807	$ 2,465

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- Definition

Employer identification number or pension plan number.

+ References

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- Definition

Amount of contributions made to multiemployer plan by employer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947

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Three digit plan number for 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.

+ References

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-Paragraph 5
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- Definition

Indicate the multiemployer plan's certified zone status as currently required by the Pension Protection Act of 2006 or a subsequent amendment thereof. The zone status categories are red (critical status), orange (seriously endangered), yellow (endangered), and green (none of the above). The acceptable values are "red", "orange", "yellow", "green", "other", and "NA". A multiemployer plan is 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.

+ References

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Expiration date of the collective bargaining arrangement requiring contributions to the multiemployer plan that will expire first in a group of associated collective bargaining arrangements, in CCYY-MM-DD format. A multiemployer plan is 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.

+ References

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Expiration date of the collective bargaining arrangement requiring contributions to the multiemployer plan that will expire last in a group of associated collective bargaining arrangements, in CCYY-MM-DD format. A multiemployer plan is 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.

+ References

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- Definition

Indicate whether a funding improvement plan or rehabilitation plan has been implemented or is pending for 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. The acceptable values are "no", "pending", "implemented", "other", and "NA".

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- Definition

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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- Definition

Indicate whether the employer paid a surcharge to the 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. The acceptable values are "no", "yes", and "NA".

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