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Capital Management and Dividends - Summary of Dividends Declared or Paid (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Dividends Payable [Line Items] |  |  |
Dividend, Total Amount | $ 390.1 us-gaap_PaymentsOfDividendsCommonStock | $ 199.1 us-gaap_PaymentsOfDividendsCommonStock | $ 188.5 us-gaap_PaymentsOfDividendsCommonStock
125 Year Anniversary Special Dividend [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Interim ordinary dividend to shareholders | $ 0.28 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = jhx_OneHundredAndTwentyFiveYearAnniversarySpecialDividendMember | $ 0.28 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = jhx_OneHundredAndTwentyFiveYearAnniversarySpecialDividendMember | $ 0.28 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = jhx_OneHundredAndTwentyFiveYearAnniversarySpecialDividendMember
Dividend, Total Amount | 124.6 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = jhx_OneHundredAndTwentyFiveYearAnniversarySpecialDividendMember | 124.6 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = jhx_OneHundredAndTwentyFiveYearAnniversarySpecialDividendMember | 124.6 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = jhx_OneHundredAndTwentyFiveYearAnniversarySpecialDividendMember
Dividend, Announcement Date | Feb. 28, 2014 | Feb. 28, 2014 | Feb. 28, 2014
Dividend, Record Date | Mar. 21, 2014 | Mar. 21, 2014 | Mar. 21, 2014
Dividend, Payment Date | May 30, 2014 | May 30, 2014 | May 30, 2014
FY 2015 First Half Dividend [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Interim ordinary dividend to shareholders | $ 0.08 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndFifteenFirstHalfDividendMember | $ 0.08 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndFifteenFirstHalfDividendMember | $ 0.08 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndFifteenFirstHalfDividendMember
Dividend, Total Amount | 34.2 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndFifteenFirstHalfDividendMember | 34.2 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndFifteenFirstHalfDividendMember | 34.2 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndFifteenFirstHalfDividendMember
Dividend, Announcement Date | Nov. 19, 2014 | Nov. 19, 2014 | Nov. 19, 2014
Dividend, Record Date | Dec. 23, 2014 | Dec. 23, 2014 | Dec. 23, 2014
Dividend, Payment Date | Feb. 27, 2015 | Feb. 27, 2015 | Feb. 27, 2015
FY 2014 First Half Dividend [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Interim ordinary dividend to shareholders | $ 0.08 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndFourteenFirstHalfDividendMember | $ 0.08 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndFourteenFirstHalfDividendMember | $ 0.08 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndFourteenFirstHalfDividendMember
Dividend, Total Amount | 35.5 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndFourteenFirstHalfDividendMember | 35.5 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndFourteenFirstHalfDividendMember | 35.5 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndFourteenFirstHalfDividendMember
Dividend, Announcement Date | Nov. 14, 2013 | Nov. 14, 2013 | Nov. 14, 2013
Dividend, Record Date | Dec. 19, 2013 | Dec. 19, 2013 | Dec. 19, 2013
Dividend, Payment Date | Mar. 28, 2014 | Mar. 28, 2014 | Mar. 28, 2014
FY 2014 Special Dividend [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Interim ordinary dividend to shareholders | $ 0.20 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndFourteenSpecialDividendMember | $ 0.20 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndFourteenSpecialDividendMember | $ 0.20 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndFourteenSpecialDividendMember
Dividend, Total Amount | 89.0 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndFourteenSpecialDividendMember | 89.0 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndFourteenSpecialDividendMember | 89.0 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndFourteenSpecialDividendMember
Dividend, Announcement Date | May 22, 2014 | May 22, 2014 | May 22, 2014
Dividend, Record Date | Jun. 12, 2014 | Jun. 12, 2014 | Jun. 12, 2014
Dividend, Payment Date | Aug. 08, 2014 | Aug. 08, 2014 | Aug. 08, 2014
FY 2014 Second Half Dividend [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Interim ordinary dividend to shareholders | $ 0.32 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndFourteenSecondHalfDividendMember | $ 0.32 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndFourteenSecondHalfDividendMember | $ 0.32 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndFourteenSecondHalfDividendMember
Dividend, Total Amount | 142.3 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndFourteenSecondHalfDividendMember | 142.3 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndFourteenSecondHalfDividendMember | 142.3 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndFourteenSecondHalfDividendMember
Dividend, Announcement Date | May 22, 2014 | May 22, 2014 | May 22, 2014
Dividend, Record Date | Jun. 12, 2014 | Jun. 12, 2014 | Jun. 12, 2014
Dividend, Payment Date | Aug. 08, 2014 | Aug. 08, 2014 | Aug. 08, 2014
FY 2013 Special Dividend [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Interim ordinary dividend to shareholders | $ 0.24 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndThirteenSpecialDividendMember | $ 0.24 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndThirteenSpecialDividendMember | $ 0.24 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndThirteenSpecialDividendMember
Dividend, Total Amount | 106.1 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndThirteenSpecialDividendMember | 106.1 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndThirteenSpecialDividendMember | 106.1 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndThirteenSpecialDividendMember
Dividend, Announcement Date | May 23, 2013 | May 23, 2013 | May 23, 2013
Dividend, Record Date | Jun. 28, 2013 | Jun. 28, 2013 | Jun. 28, 2013
Dividend, Payment Date | Jul. 26, 2013 | Jul. 26, 2013 | Jul. 26, 2013
FY 2012 Second Half Dividend [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Interim ordinary dividend to shareholders | $ 0.13 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndTwelveSecondHalfDividendMember | $ 0.13 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndTwelveSecondHalfDividendMember | $ 0.13 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndTwelveSecondHalfDividendMember
Dividend, Total Amount | $ 57.5 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndTwelveSecondHalfDividendMember | $ 57.5 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndTwelveSecondHalfDividendMember | $ 57.5 us-gaap_PaymentsOfDividendsCommonStock / us-gaap_DividendsAxis = jhx_FiscalYearTwoThousandAndTwelveSecondHalfDividendMember
Dividend, Announcement Date | May 23, 2013 | May 23, 2013 | May 23, 2013
Dividend, Record Date | Jun. 28, 2013 | Jun. 28, 2013 | Jun. 28, 2013
Dividend, Payment Date | Jul. 26, 2013 | Jul. 26, 2013 | Jul. 26, 2013

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