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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, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Property, Plant and Equipment [Line Items] |  |  |
Capitalized interest | $ 2.0 | $ 3.2 | $ 1.7
Net book value of disposals | 15.0 |  |
Net book value of disposals, usage of replacement parts | 13.1 |  |
Net book value of disposals, impairment charges | 0.5 |  |
Net book value of disposals, disposal of assets no longer in use | 1.4 |  |
Buildings [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Buildings held for sale | $ 4.5 |  |

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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 Property plant and equipment disposals of assets no longer in use. + References No definition available. + Details
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- Definition Property plant and equipment disposals usage of replacement parts. + References No definition available. + Details
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- Definition Amount classified as property, plant and equipment attributable to disposal group held for sale or disposed of. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e1107-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2941-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721533-107759 + 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=66902209&loc=d3e3213-108585 + Details
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