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Comparison of Total Assets (Parenthetical) (Detail) (Corporate Vessels, USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Sep. 30, 2014	Mar. 31, 2014
Corporate Vessels
Segment and Geographic Distribution of Operations [Line Items]
Construction costs	$ 250.0	$ 228.9

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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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