Employee Benefit Plans - Multiemployer Plan (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Dec. 31, 2013
Multiemployer Plans [Line Items]
Contribution by Entity	$ 1.1
Operating Engineers
Multiemployer Plans [Line Items]
Pension Protection Act Zone Status	Red
Contribution by Entity	1.0
Surcharge Imposed	No
Laborers National
Multiemployer Plans [Line Items]
Pension Protection Act Zone Status	Red
Contribution by Entity	0
Surcharge Imposed	No
Hawaii Laborers
Multiemployer Plans [Line Items]
Pension Protection Act Zone Status	Green
Contribution by Entity	0.1
Surcharge Imposed	No
Hawaii Laborers
Multiemployer Plans [Line Items]
Pension Protection Act Zone Status	Green
Contribution by Entity	$ 0
Surcharge Imposed	No

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.

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

Name:	us-gaap_MultiemployerPlanPeriodContributions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration