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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Jun. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Unapproved change orders	$ 13.1	$ 12.7

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

The amount of costs incurred on unapproved change orders when it is probable that the cost will be recovered through a change in the contract price.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 910



-SubTopic 310



-Section 50



-Paragraph 1



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=51673017&loc=d3e49324-109356



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 910



-SubTopic 340



-Section 50



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=51666792&loc=d3e50000-109363



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



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 02



-Paragraph 3



-Subparagraph c(3)



-Article 5

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
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