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Comparison of Total Assets (Parenthetical) (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Sep. 30, 2015	Mar. 31, 2015
Corporate Vessels
Segment and Geographic Distribution of Operations [Line Items]
Construction costs	$ 133.0	$ 235.2

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- Definition

Segment and Geographic Distribution of Operations [Line Items]

+ References

No definition available.

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- Definition

The aggregate costs related to construction and development services during the reporting period.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



-Section S99



-Paragraph 2



-Subparagraph (SX 210.5-03.2)



-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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