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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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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

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Amount billed to customers under long-term contracts or programs that have been withheld because of retainage provisions in a contract to be collected after the next fiscal year following the latest fiscal year.

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Amount of billed or unbilled claims or other similar items subject to uncertainty concerning their determination or ultimate realization under long-term contracts.

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