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Property, Plant and Equipment - Components of Property, Plant and Equipment (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Property Plant And Equipment Capitalized Interest Costs [Abstract]
Capitalized interest	$ 3.2	$ 1.7
Net book value of disposals	16.4
Net book value of disposals, usage of replacement parts	10.9
Net book value of disposals, impairment charges	3.5
Net book value of disposals, disposal of assets no longer in use	$ 2.0

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- Definition

Property Plant And Equipment Capitalized Interest Costs [Abstract]

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No definition available.

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- Definition

Property plant and equipment disposal impairment charges.

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No definition available.

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- Definition

Property plant and equipment disposals net.

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No definition available.

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- Definition

Property plant and equipment disposals of assets no longer in use.

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No definition available.

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- Definition

Property plant and equipment disposals usage of replacement parts.

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No definition available.

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- Definition

The amount of cash paid during the current period for interest that is capitalized.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585

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