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Property, Plant and Equipment - Additional Information (Detail) (USD $) | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense | $ 70,200,000 us-gaap_Depreciation | $ 61,300,000 us-gaap_Depreciation | $ 60,000,000 us-gaap_Depreciation
Restricted assets value of property, plant and equipment | 1,300,000 us-gaap_OtherRestrictedAssetsNoncurrent | 1,700,000 us-gaap_OtherRestrictedAssetsNoncurrent |
Asset impairment charges |  |  | 16,900,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Plant Facility Level [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Asset impairment charges | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = jhx_PlantFacilityLevelMember | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = jhx_PlantFacilityLevelMember |
Cost of Goods Sold [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Asset impairment charges | 3,700,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
USA & Europe Fiber Cement [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Asset impairment charges |  |  | 16,900,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_StatementBusinessSegmentsAxis = jhx_UnitedStatesOfAmericaAndEuropeFiberCementMember
USA & Europe Fiber Cement [Member] | Plant Facility Level [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Asset impairment charges |  |  | 16,900,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = jhx_PlantFacilityLevelMember / us-gaap_StatementBusinessSegmentsAxis = jhx_UnitedStatesOfAmericaAndEuropeFiberCementMember
USA & Europe Fiber Cement [Member] | Buildings, Land and Manufacturing Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Asset impairment charges |  |  | 4,400,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_PropertyPlantAndEquipmentByTypeAxis = jhx_LandBuildingAndEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = jhx_UnitedStatesOfAmericaAndEuropeFiberCementMember
USA & Europe Fiber Cement [Member] | Redundant and Manufacturing Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Asset impairment charges |  |  | 12,500,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_PropertyPlantAndEquipmentByTypeAxis = jhx_RedundantAndManufacturingEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = jhx_UnitedStatesOfAmericaAndEuropeFiberCementMember
USA & Europe Fiber Cement [Member] | Redundant Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Asset impairment charges |  |  | 2,800,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_PropertyPlantAndEquipmentByTypeAxis = jhx_RedundantEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = jhx_UnitedStatesOfAmericaAndEuropeFiberCementMember
USA & Europe Fiber Cement [Member] | Manufacturing Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Asset impairment charges |  |  | $ 9,700,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_PropertyPlantAndEquipmentByTypeAxis = jhx_ManufacturingEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = jhx_UnitedStatesOfAmericaAndEuropeFiberCementMember

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28367520&loc=d3e92212-112881 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Impairment -URI http://asc.fasb.org/extlink&oid=6515133 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Other long-term assets not otherwise listed in the existing taxonomy that are pledged or subject to withdrawal restrictions. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |