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Income Taxes - Reconciled Tax at Statutory Rates (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Income Tax Disclosure [Abstract] |  |  |
Income tax (expense) benefit at statutory tax rates | $ (75.0)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 6.2 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 8.8 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
US state income taxes, net of the federal benefit | (2.4)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | (1.8)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | (0.1)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Asbestos adjustments | 48.3 jhx_IncomeTaxReconciliationAsbestosAdjustments | 30.2 jhx_IncomeTaxReconciliationAsbestosAdjustments | (0.3)jhx_IncomeTaxReconciliationAsbestosAdjustments
Expenses not deductible | (3.4)us-gaap_IncomeTaxReconciliationNondeductibleExpense | (2.1)us-gaap_IncomeTaxReconciliationNondeductibleExpense | (2.0)us-gaap_IncomeTaxReconciliationNondeductibleExpense
Non-assessable items | 0.5 jhx_IncomeTaxReconciliationNonAssessableItems | 0.6 jhx_IncomeTaxReconciliationNonAssessableItems | 1.8 jhx_IncomeTaxReconciliationNonAssessableItems
Foreign taxes on domestic income | (0.7)jhx_IncomeTaxReconciliationForeignTaxesOnDomesticIncome |  |
Amortization of intangibles | 2.8 jhx_IncomeTaxReconciliationAmortizationOfIntangibles | 1.7 jhx_IncomeTaxReconciliationAmortizationOfIntangibles | 2.0 jhx_IncomeTaxReconciliationAmortizationOfIntangibles
Taxes on foreign income | (4.5)jhx_IncomeTaxReconciliationTaxesOnForeignIncome | (2.9)jhx_IncomeTaxReconciliationTaxesOnForeignIncome | 1.1 jhx_IncomeTaxReconciliationTaxesOnForeignIncome
Tax assessment in dispute |  | 10.7 jhx_IncomeTaxReconciliationTaxAssessmentsInDispute |
Other items | 3.1 us-gaap_IncomeTaxReconciliationOtherAdjustments | 2.3 us-gaap_IncomeTaxReconciliationOtherAdjustments | 0.5 us-gaap_IncomeTaxReconciliationOtherAdjustments
Total income tax (expense) benefit | $ (31.3)us-gaap_IncomeTaxExpenseBenefit | $ 44.9 us-gaap_IncomeTaxExpenseBenefit | $ 11.8 us-gaap_IncomeTaxExpenseBenefit
Effective tax rate | 9.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations | (82.20%)us-gaap_EffectiveIncomeTaxRateContinuingOperations | (35.00%)us-gaap_EffectiveIncomeTaxRateContinuingOperations

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- Definition Income tax reconciliation amortization of intangibles. + References No definition available. + Details
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- Definition Income tax reconciliation asbestos adjustments. + References No definition available. + Details
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- Definition Income tax reconciliation foreign taxes on domestic income + References No definition available. + Details
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- Definition Income tax reconciliation non assessable items. + References No definition available. + Details
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- Definition Tax assessment in dispute related to Australian Taxation Office - Amended Assessment. + References No definition available. + Details
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- Definition Taxes on subsidiary foreign income and withholding taxes paid or accrued on foreign interest, royalties and dividends. + References No definition available. + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1 -Article 4 + Details
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