James Hardie Industries plc Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Derivative Instruments - Schedule of Total Outstanding Notional Amount and Fair Value of Derivative Instruments (Detail)

Derivative Instruments - Schedule of Total Outstanding Notional Amount and Fair Value of Derivative Instruments (Detail) (USD $)	Mar. 31, 2015	Mar. 31, 2014
Derivatives, Fair Value [Line Items]
Notional Amount	$ 128,600,000invest_DerivativeNotionalAmount	$ 258,700,000invest_DerivativeNotionalAmount
Derivative Assets		2,300,000us-gaap_DerivativeAssets
Derivative Liabilities	3,300,000us-gaap_DerivativeLiabilities	500,000us-gaap_DerivativeLiabilities
Interest Rate Swap Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	125,000,000
Derivatives Accounted for As Hedges [Member] \| Foreign Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		9,700,000
Derivative Assets		500,000
Derivatives Not Accounted for As Hedges [Member] \| Foreign Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	3,600,000	124,000,000
Derivative Assets		1,800,000
Derivative Liabilities	200,000
Derivatives Not Accounted for As Hedges [Member] \| Interest Rate Swap Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	125,000,000	125,000,000
Derivative Liabilities	$ 3,100,000	$ 500,000

- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References + Details

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References + Details