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Stock-Based Compensation - Additional Information (Detail) AUD / shares in Units, AUD in Millions, $ in Millions |  |  |  | 12 Months Ended
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Sep. 16, 2016 shares | Sep. 16, 2015 shares | Sep. 14, 2015 shares | Mar. 31, 2017 USD ($) shares | Mar. 31, 2017 AUD AUD / shares shares | Mar. 31, 2016 USD ($) shares | Mar. 31, 2016 AUD shares | Mar. 31, 2015 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation cost related to stock-based compensation cost | $ |  |  |  | $ 15.0 |  |  |  |
Estimated weighted average amortization, period of recognition |  |  |  | 1 year 7 months 6 days | 1 year 7 months 6 days |  |  |
Issue of shares authorized |  |  |  |  |  | 5,000,000 | 5,000,000 |
Restricted stock units granted |  |  |  | 1,179,994 | 1,179,994 | 1,410,560 | 1,410,560 |
Restricted stock units outstanding |  |  |  | 3,340,245 |  | 4,049,454 | 4,049,454 | 4,008,001
Intrinsic value of stock options exercised | AUD |  |  |  |  | AUD 0.8 |  | AUD 2.9 |
Excess tax benefits from share-based awards | $ |  |  |  | $ 3.0 |  | $ 0.4 |  | $ 1.4
Closing stock price | AUD / shares |  |  |  |  | AUD 20.57 |  |  |
Restricted stock units vested |  |  |  | 1,314,825 | 1,314,825 | 1,219,352 | 1,219,352 |
Unvested restricted stock units cancelled |  |  |  | 574,378 | 574,378 | 149,755 | 149,755 |
Scorecard LTI - cash settled units granted under the terms of LTIP | 458,484 | 566,936 |  |  |  |  |  |
Average closing price period | 20 days | 20 days |  |  |  |  |  |
Restricted Stock Units Performance Vesting [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
LTI units granted | 407,539 | 503,944 |  |  |  |  |  |
Restricted stock units vested |  |  |  | 281,468 | 281,468 |  |  |
Restricted stock unit deferred vesting period |  | 3 years |  |  |  |  |  |
Unvested restricted stock units cancelled | 152,611 |  |  |  |  |  |  |
Restricted Stock Units Service Vesting [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted stock units granted |  |  |  | 315,636 | 315,636 | 327,354 | 327,354 |
Restricted stock units vested |  |  |  | 304,470 | 304,470 | 228,481 | 228,481 |
Restricted Stock Units (Market Condition) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted stock units granted | 456,819 | 579,262 |  |  |  |  |  |
Restricted stock units vested |  |  |  | 728,887 | 728,887 | 659,725 | 659,725 |
Long Term Incentive Award [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
LTI units granted | 316,841 |  | 288,552 |  |  |  |  |
Long Term Incentive Award [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
LTI units granted | 518,647 |  | 506,627 |  |  |  |  |
Long Term Incentive Award [Member] | Maximum [Member] | James Hardie Industries Plc [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Average closing price period | 20 days |  | 20 days |  |  |  |  |
Long-Term Incentive Plan 2006 [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted stock units outstanding |  |  |  | 2,720,664 |  |  |  |
LTI units granted |  |  |  | 11,027,496 | 11,027,496 |  |  |
2001 Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Issue of shares authorized |  |  |  | 45,077,100 |  |  |  |
Percentage of grants exercised after first year |  |  |  | 25.00% | 25.00% |  |  |
Percentage of grants exercised after second year |  |  |  | 25.00% | 25.00% |  |  |
Percentage of grants exercised after third year |  |  |  | 50.00% | 50.00% |  |  |
Unexercised grants expiration year |  |  |  | 10 years | 10 years |  |  |
Unexercised grants expiration days |  |  |  | 90 days | 90 days |  |  |
Restricted stock units granted |  |  |  | 315,636 | 315,636 | 327,354 | 327,354 |
Restricted stock units outstanding |  |  |  | 619,581 |  |  |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=65896087&loc=d3e11374-113907 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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