XML 92 R49.htm IDEA: XBRL DOCUMENT
v3.20.1

Revenues (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | $ 2,606.8 | $ 2,506.6 | $ 2,054.5
Fiber cement revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 2,282.8 | 2,159.5 | 2,039.8
Fiber gypsum revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 323.4 | 332.5 | 0.0
Other revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 0.6 | 14.6 | 14.7
North America Fiber Cement |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 1,816.4 | 1,676.9 | 1,578.1
North America Fiber Cement | Fiber cement revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 1,816.4 | 1,676.9 | 1,578.1
North America Fiber Cement | Fiber gypsum revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
North America Fiber Cement | Other revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Asia Pacific Fiber Cement |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 418.4 | 446.8 | 425.4
Asia Pacific Fiber Cement | Fiber cement revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 418.4 | 446.8 | 425.4
Asia Pacific Fiber Cement | Fiber gypsum revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Asia Pacific Fiber Cement | Other revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Europe Building Products |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 371.4 | 368.3 | 36.3
Europe Building Products | Fiber cement revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 48.0 | 35.8 | 36.3
Europe Building Products | Fiber gypsum revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 323.4 | 332.5 | 0.0
Europe Building Products | Other revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Other Businesses |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 0.6 | 14.6 | 14.7
Other Businesses | Fiber cement revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Other Businesses | Fiber gypsum revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Other Businesses | Other revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | $ 0.6 | $ 14.6 | $ 14.7

X
- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
Name: | us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingRevenueReconcilingItemLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_ProductOrServiceAxis=jhx_FibercementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=jhx_FibergypsumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=jhx_OtherrevenuesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=jhx_NorthAmericaFiberCementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=jhx_AsiaPacificFiberCementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=jhx_EuropeBuildingProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=jhx_OtherBusinessesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |