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Operating Segment Information and Concentrations of Risk - Operating Segments and Geographical Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 1,656.9 us-gaap_SalesRevenueGoodsNet | $ 1,493.8 us-gaap_SalesRevenueGoodsNet | $ 1,321.3 us-gaap_SalesRevenueGoodsNet
Total operating income | 335.0 us-gaap_OperatingIncomeLoss | 53.1 us-gaap_OperatingIncomeLoss | 29.5 us-gaap_OperatingIncomeLoss
Net interest expense | (7.5)us-gaap_InterestIncomeExpenseNet | (1.1)us-gaap_InterestIncomeExpenseNet | 2.4 us-gaap_InterestIncomeExpenseNet
Other (expense) income | (4.9)us-gaap_OtherNonoperatingIncomeExpense | 2.6 us-gaap_OtherNonoperatingIncomeExpense | 1.8 us-gaap_OtherNonoperatingIncomeExpense
Total Identifiable Assets | 2,044.5 us-gaap_Assets | 2,104.0 us-gaap_Assets |
General Corporate [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total operating income | (19.0)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = jhx_GeneralCorporateMember | (240.6)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = jhx_GeneralCorporateMember | (151.8)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = jhx_GeneralCorporateMember
Total Identifiable Assets | 784.7 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = jhx_GeneralCorporateMember | 1,066.6 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = jhx_GeneralCorporateMember |
USA [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,238.5 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = country_US | 1,094.6 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = country_US | 923.8 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = country_US
Total Identifiable Assets | 956.4 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = country_US | 785.8 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = country_US |
Australia [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 267.7 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = country_AU | 259.2 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = country_AU | 272.0 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = country_AU
Total Identifiable Assets | 223.4 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = country_AU | 173.8 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = country_AU |
New Zealand [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 64.7 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = country_NZ | 63.0 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = country_NZ | 56.1 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = country_NZ
Total Identifiable Assets | 25.8 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = country_NZ | 29.4 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = country_NZ |
Other Countries [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 86.0 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = jhx_OtherCountriesMember | 77.0 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = jhx_OtherCountriesMember | 69.4 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = jhx_OtherCountriesMember
Total Identifiable Assets | 54.2 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = jhx_OtherCountriesMember | 48.4 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = jhx_OtherCountriesMember |
Segments Total [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total operating income | 354.0 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = jhx_SegmentsMember | 293.7 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = jhx_SegmentsMember | 181.3 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = jhx_SegmentsMember
Total Identifiable Assets | 1,259.8 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = jhx_SegmentsMember | 1,037.4 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = jhx_SegmentsMember |
Worldwide Total [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,656.9 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = jhx_WorldwideMember | 1,493.8 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = jhx_WorldwideMember | 1,321.3 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = jhx_WorldwideMember
Total operating income | 322.6 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = jhx_WorldwideMember | 54.6 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = jhx_WorldwideMember | 33.7 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = jhx_WorldwideMember
Total Identifiable Assets | 2,044.5 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = jhx_WorldwideMember | 2,104.0 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = jhx_WorldwideMember |
USA & Europe Fiber Cement [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 1,276.5 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = jhx_UnitedStatesOfAmericaAndEuropeFiberCementMember | 1,127.6 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = jhx_UnitedStatesOfAmericaAndEuropeFiberCementMember | 951.4 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = jhx_UnitedStatesOfAmericaAndEuropeFiberCementMember
Total operating income | 285.9 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = jhx_UnitedStatesOfAmericaAndEuropeFiberCementMember | 237.0 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = jhx_UnitedStatesOfAmericaAndEuropeFiberCementMember | 145.6 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = jhx_UnitedStatesOfAmericaAndEuropeFiberCementMember
Total Identifiable Assets | 959.3 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = jhx_UnitedStatesOfAmericaAndEuropeFiberCementMember | 782.6 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = jhx_UnitedStatesOfAmericaAndEuropeFiberCementMember |
Asia Pacific Fiber Cement [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 380.4 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = jhx_AsiaPacificFiberCementMember | 366.2 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = jhx_AsiaPacificFiberCementMember | 369.9 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = jhx_AsiaPacificFiberCementMember
Total operating income | 94.1 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = jhx_AsiaPacificFiberCementMember | 81.1 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = jhx_AsiaPacificFiberCementMember | 61.7 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = jhx_AsiaPacificFiberCementMember
Total Identifiable Assets | 279.8 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = jhx_AsiaPacificFiberCementMember | 235.1 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = jhx_AsiaPacificFiberCementMember |
Research and Development [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total operating income | (26.0)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResearchAndDevelopmentArrangementMember | (24.4)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResearchAndDevelopmentArrangementMember | (26.0)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResearchAndDevelopmentArrangementMember
Total Identifiable Assets | $ 20.7 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResearchAndDevelopmentArrangementMember | $ 19.7 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResearchAndDevelopmentArrangementMember |

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