XML 110 R60.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Long-Term Debt - Summary of Company's Credit Facilities (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 1 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Nov. 30, 2014 | May 31, 2014
Line of Credit Facility [Line Items] |  |  |
Total Facility | $ 590.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  |
Principal Drawn | 397.5 us-gaap_LongTermDebtNoncurrent |  |
Term Facility Maturity March 2016 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Term facilities, description of variable rate | LIBOR plus margin |  |
Term facilities, maturity period | 2016-03 |  |
Total Facility | 50.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = jhx_TermFacilitiesMaturityMarchTwoZeroOneSixMember |  |
Term Facility Maturity April 2016 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Term facilities, description of variable rate | LIBOR plus margin |  |
Term facilities, maturity period | 2016-04 | 2016-04 |
Total Facility | 150.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = jhx_TermFacilitiesMaturityAprilTwoZeroOneSixMember |  |
Term Facility Maturity April 2017 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Term facilities, description of variable rate | LIBOR plus margin |  |
Term facilities, maturity period | 2017-04 |  |
Total Facility | 100.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = jhx_TermFacilitiesMaturityAprilTwoZeroOneSevenMember |  | 25.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = jhx_TermFacilitiesMaturityAprilTwoZeroOneSevenMember
Term Facility Maturity November 2017 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Term facilities, description of variable rate | LIBOR plus margin |  |
Term facilities, maturity period | 2017-11 | 2017-11 |
Effective Interest Rate | 1.40%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_LineOfCreditFacilityAxis = jhx_TermFacilitiesMaturityNovemberTwoZeroOneSevenMember |  |
Total Facility | 125.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = jhx_TermFacilitiesMaturityNovemberTwoZeroOneSevenMember | 125.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = jhx_TermFacilitiesMaturityNovemberTwoZeroOneSevenMember |
Principal Drawn | 75.0 us-gaap_LongTermDebtNoncurrent / us-gaap_LineOfCreditFacilityAxis = jhx_TermFacilitiesMaturityNovemberTwoZeroOneSevenMember |  |
Term Facility Maturity March 2019 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Term facilities, description of variable rate | LIBOR plus margin |  |
Term facilities, maturity period | 2019-03 |  |
Total Facility | 40.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = jhx_TermFacilitiesMaturityMarchTwoZeroOneNineMember |  | 40.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = jhx_TermFacilitiesMaturityMarchTwoZeroOneNineMember
Term Facility Maturity April 2019 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Term facilities, description of variable rate | LIBOR plus margin |  |
Term facilities, maturity period | 2019-04 |  |
Total Facility | 50.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = jhx_TermFacilitiesMaturityAprilTwoZeroOneNineMember |  | 50.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = jhx_TermFacilitiesMaturityAprilTwoZeroOneNineMember
Term Facility Maturity May 2019 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Term facilities, description of variable rate | LIBOR plus margin |  |
Term facilities, maturity period | 2019-05 |  |
Total Facility | $ 75.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = jhx_TermFacilitiesMaturityMayTwoZeroOneNineMember |  | $ 75.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = jhx_TermFacilitiesMaturityMayTwoZeroOneNineMember

X
- Definition Line Of Credit Facility Maturity Year And Month + References No definition available. + Details
Name: | jhx_LineOfCreditFacilityMaturityYearAndMonth
Namespace Prefix: | jhx_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
Name: | us-gaap_LongTermDebtNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=jhx_TermFacilitiesMaturityAprilTwoZeroOneNineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=jhx_TermFacilitiesMaturityAprilTwoZeroOneSevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=jhx_TermFacilitiesMaturityAprilTwoZeroOneSixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=jhx_TermFacilitiesMaturityMarchTwoZeroOneNineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=jhx_TermFacilitiesMaturityMarchTwoZeroOneSixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=jhx_TermFacilitiesMaturityMayTwoZeroOneNineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=jhx_TermFacilitiesMaturityNovemberTwoZeroOneSevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |