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Commitments and Contingencies (Narrative) (Details) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Guarantee Obligations [Line Items] |  |  |  |  |
Lease expense for operating leases |  |  | $ 3,900,000 | $ 4,700,000 | $ 4,300,000
Loss on sublease and write-off of leasehold improvements |  | 1,700,000 |  |  |
Additional bonding capacity |  |  | 301,300,000 |  |
Proceeds from legal settlements | 1,700,000 |  |  |  |
Powell (UK) Limited |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |
Guarantee liability |  |  | 2,600,000 |  |
Revolving credit facility |  |  | 16,200,000 |  |
Amount of credit facility remaining borrowing capacity |  |  | 13,600,000 |  |
Financial Standby Letter of Credit |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |
Guarantee liability |  |  | 21,500,000 |  |
Performance Guarantee |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |
Guarantee liability |  |  | $ 298,700,000 |  |

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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