Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Participation and contributions to multiemployer pension plans
Partnership Contributions	$ 7,237	$ 6,930	$ 7,697
New England Teamsters & Trucking Industry Pension Fund [Member]
Participation and contributions to multiemployer pension plans
EIN	04-6372430
Pension Plan Number	001
Pension Protection Act Zone Status	Yellow	Red
FIP/RP Status (Pending / Implemented)	NA
Partnership Contributions	2,532	2,512	2,790
Surcharge Imposed	No
Expiration Date of Collective-Bargaining Agreement	Mar. 31, 2014
Westchester Teamsters Pension Fund [Member]
Participation and contributions to multiemployer pension plans
EIN	13-6123973
Pension Plan Number	001
Pension Protection Act Zone Status	Green	Green
FIP/RP Status (Pending / Implemented)	NA
Partnership Contributions	771	817	908
Surcharge Imposed	No
Expiration Date of Collective-Bargaining Agreement	Jan. 31, 2014
Local 553 Pension Fund [Member]
Participation and contributions to multiemployer pension plans
EIN	13-6637826
Pension Plan Number	001
Pension Protection Act Zone Status	Green	Green
FIP/RP Status (Pending / Implemented)	NA
Partnership Contributions	2,152	2,082	2,313
Surcharge Imposed	No
Expiration Date of Collective-Bargaining Agreement	Jan. 15, 2014
Local 463 Pension Fund [Member]
Participation and contributions to multiemployer pension plans
EIN	11-1800729
Pension Plan Number	001
Pension Protection Act Zone Status	Green	Red
FIP/RP Status (Pending / Implemented)	NA
Partnership Contributions	155	155	172
Surcharge Imposed	No
Expiration Date of Collective-Bargaining Agreement	Feb. 28, 2014
All Other Multiemployer Pension Plans [Member]
Participation and contributions to multiemployer pension plans
Partnership Contributions	$ 1,627	$ 1,364	$ 1,514

Entity tax identification numbers.

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- Definition

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 5

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947

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- Definition

Amount of contributions made to multiemployer plans by the employer. 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450702-114947

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450691-114947

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 5

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 5

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947

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- Definition

Expiration date of the collective bargaining arrangement requiring contributions to the multiemployer plan, 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 5

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947

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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".

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 5

-Subparagraph (f)(1)

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947

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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".

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 5

-Subparagraph (f)(2)

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947

+ Details

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