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Uncompleted Contracts - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2014 | Jun. 30, 2013
Customer Contracts [Line Items] |  |  |
Contract Receivable Retainage, Due in Next Twelve Months |  | $ 27.4 | $ 19.9
Contract Receivable Retainage, Due after Next Twelve Months |  | 4.9 | 3.1
Change In Accounting Estimate, Financial Effect, Operating Income | 3.1 | 5.4 |
S.M. Electric Company |  |  |
Customer Contracts [Line Items] |  |  |
Estimate of the remaining amount to be collected |  | 0.7 |
Contract Receivable |  | $ 2.9 |

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- Definition Amount billed to customers under long-term contracts or programs but not paid. Excludes amounts due that have been withheld because of retainage provisions in a contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 910 -SubTopic 310 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6471494&loc=d3e49354-109356 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph c -Article 5 + Details
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