Participation and Contributions to Multi Employer Pension Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Multiemployer Plans [Line Items]
Company Contributions	$ 9,637	$ 9,335	$ 9,311
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
Company Contributions	$ 2,616	$ 2,627	2,721
Surcharge Imposed	No
New England Teamsters & Trucking Industry Pension Fund | Minimum
Multiemployer Plans [Line Items]
Expiration Date of Collective-Bargaining Agreements, Date	Aug. 31, 2027
New England Teamsters & Trucking Industry Pension Fund | Maximum
Multiemployer Plans [Line Items]
Expiration Date of Collective-Bargaining Agreements, Date	Mar. 31, 2030
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
Company Contributions	$ 1,420	$ 921	964
Surcharge Imposed	No
Westchester Teamsters Pension Fund | Minimum
Multiemployer Plans [Line Items]
Expiration Date of Collective-Bargaining Agreements, Date	Jan. 31, 2029
Westchester Teamsters Pension Fund | Maximum
Multiemployer Plans [Line Items]
Expiration Date of Collective-Bargaining Agreements, Date	Dec. 31, 2029
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
Company Contributions	$ 2,440	$ 2,457	2,516
Surcharge Imposed	No
Local 553 Pension Fund | Minimum
Multiemployer Plans [Line Items]
Expiration Date of Collective-Bargaining Agreements, Date	Dec. 15, 2025
Local 553 Pension Fund | Maximum
Multiemployer Plans [Line Items]
Expiration Date of Collective-Bargaining Agreements, Date	Jan. 15, 2026
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
Company Contributions	$ 114	$ 119	125
Surcharge Imposed	No
Local 463 Pension Fund | Minimum
Multiemployer Plans [Line Items]
Expiration Date of Collective-Bargaining Agreements, Date	Feb. 28, 2026
Local 463 Pension Fund | Maximum
Multiemployer Plans [Line Items]
Expiration Date of Collective-Bargaining Agreements, Date	Jun. 30, 2028
IAM National Pension Fund
Multiemployer Plans [Line Items]
EIN	516031295
Pension Plan Number	002
Pension Protection Act Zone Status	Red	Red
FIP / RP Status Pending / Implemented	Implemented
Company Contributions	$ 2,446	$ 2,749	2,477
Surcharge Imposed	Yes
IAM National Pension Fund | Minimum
Multiemployer Plans [Line Items]
Expiration Date of Collective-Bargaining Agreements, Date	Jun. 30, 2026
IAM National Pension Fund | Maximum
Multiemployer Plans [Line Items]
Expiration Date of Collective-Bargaining Agreements, Date	Sep. 30, 2028
All Other Multiemployer Pension Plans
Multiemployer Plans [Line Items]
Company Contributions	$ 580	$ 444	481
Teamsters Local 469 Pension Plan
Multiemployer Plans [Line Items]
EIN	226172237
Pension Plan Number	001
Pension Protection Act Zone Status	Red	Red
FIP / RP Status Pending / Implemented	Implemented
Company Contributions	$ 11	$ 11	18
Surcharge Imposed	No
Expiration Date of Collective-Bargaining Agreements, Date	Aug. 31, 2027
Local 445 Pension Fund
Multiemployer Plans [Line Items]
EIN	131864489
Pension Plan Number	001
Pension Protection Act Zone Status	Red	Red
FIP / RP Status Pending / Implemented	Implemented
Company Contributions	$ 10	$ 7	$ 9
Surcharge Imposed	No
Expiration Date of Collective-Bargaining Agreements, Date	Oct. 31, 2029