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Property, Plant and Equipment - Components of Property, Plant and Equipment (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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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] + References No definition available. + Details
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- Definition Property plant and equipment disposal impairment charges. + References No definition available. + Details
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- Definition Property plant and equipment disposals net. + References No definition available. + Details
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- Definition The amount of cash paid during the current period for interest that is capitalized. + References 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 + Details
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