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v2.4.1.9

Stock-Based Compensation - Outstanding and Exercisable Options under 2001 Equity Incentive Plan and Long-Term Incentive Plan (Detail) (AUD) | 12 Months Ended |  |
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Options outstanding Number | 511,780 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 1,099,276 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 5,156,136 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options outstanding, weighted average exercise price | 8.17 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | 8.11 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | 7.94 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Options outstanding, aggregate intrinsic value | 3,626,532 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue |  |
Options exercisable, Number | 511,780 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber |  |
Options exercisable, aggregate intrinsic value | 3,626,532 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 |  |
Weighted Average Exercise Price 6.38 [Member] |  |  |
Exercise Price | 6.38 jhx_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePrice / dei_LegalEntityAxis = jhx_ExercisePriceOneMember |  |
Options outstanding Number | 103,080 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / dei_LegalEntityAxis = jhx_ExercisePriceOneMember |  |
Options outstanding, Weighted average remaining life | 2 years 8 months 12 days |  |
Options outstanding, weighted average exercise price | 6.38 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / dei_LegalEntityAxis = jhx_ExercisePriceOneMember |  |
Options outstanding, aggregate intrinsic value | 915,350 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / dei_LegalEntityAxis = jhx_ExercisePriceOneMember |  |
Options exercisable, Number | 103,080 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / dei_LegalEntityAxis = jhx_ExercisePriceOneMember |  |
Options exercisable weighted average exercise price | 6.38 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / dei_LegalEntityAxis = jhx_ExercisePriceOneMember |  |
Options exercisable, aggregate intrinsic value | 915,350 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 / dei_LegalEntityAxis = jhx_ExercisePriceOneMember |  |
Weighted Average Exercise Price 8.40 [Member] |  |  |
Exercise Price | 8.40 jhx_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePrice / dei_LegalEntityAxis = jhx_ExercisePriceTwoMember |  |
Options outstanding Number | 223,700 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / dei_LegalEntityAxis = jhx_ExercisePriceTwoMember |  |
Options outstanding, Weighted average remaining life | 1 year 7 months 6 days |  |
Options outstanding, weighted average exercise price | 8.40 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / dei_LegalEntityAxis = jhx_ExercisePriceTwoMember |  |
Options outstanding, aggregate intrinsic value | 1,534,582 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / dei_LegalEntityAxis = jhx_ExercisePriceTwoMember |  |
Options exercisable, Number | 223,700 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / dei_LegalEntityAxis = jhx_ExercisePriceTwoMember |  |
Options exercisable weighted average exercise price | 8.40 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / dei_LegalEntityAxis = jhx_ExercisePriceTwoMember |  |
Options exercisable, aggregate intrinsic value | 1,534,582 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 / dei_LegalEntityAxis = jhx_ExercisePriceTwoMember |  |
Weighted Average Exercise Price 8.90 [Member] |  |  |
Exercise Price | 8.90 jhx_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePrice / dei_LegalEntityAxis = jhx_ExercisePriceThreeMember |  |
Options outstanding Number | 185,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / dei_LegalEntityAxis = jhx_ExercisePriceThreeMember |  |
Options outstanding, Weighted average remaining life | 8 months 12 days |  |
Options outstanding, weighted average exercise price | 8.90 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / dei_LegalEntityAxis = jhx_ExercisePriceThreeMember |  |
Options outstanding, aggregate intrinsic value | 1,176,600 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / dei_LegalEntityAxis = jhx_ExercisePriceThreeMember |  |
Options exercisable, Number | 185,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / dei_LegalEntityAxis = jhx_ExercisePriceThreeMember |  |
Options exercisable weighted average exercise price | 8.90 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / dei_LegalEntityAxis = jhx_ExercisePriceThreeMember |  |
Options exercisable, aggregate intrinsic value | 1,176,600 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 / dei_LegalEntityAxis = jhx_ExercisePriceThreeMember |  |

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- Definition Share based compensation shares authorized under stock option plans exercise price. + References No definition available. + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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