XML 90 R49.htm IDEA: XBRL DOCUMENT
v3.21.1

Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |
Net sales | $ 2,908.7 | $ 2,606.8 | $ 2,506.6
Fiber cement revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 2,553.7 | 2,282.8 | 2,159.5
Fiber gypsum revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 355.0 | 323.4 | 332.5
Other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales |  | 0.6 | 14.6
North America Fiber Cement |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 2,040.2 | 1,816.4 | 1,676.9
North America Fiber Cement | Fiber cement revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 2,040.2 | 1,816.4 | 1,676.9
North America Fiber Cement | Fiber gypsum revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
North America Fiber Cement | Other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales |  | 0.0 | 0.0
Asia Pacific Fiber Cement |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 458.2 | 418.4 | 446.8
Asia Pacific Fiber Cement | Fiber cement revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 458.2 | 418.4 | 446.8
Asia Pacific Fiber Cement | Fiber gypsum revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Asia Pacific Fiber Cement | Other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales |  | 0.0 | 0.0
Europe Building Products |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 410.3 | 371.4 | 368.3
Europe Building Products | Fiber cement revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 55.3 | 48.0 | 35.8
Europe Building Products | Fiber gypsum revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 355.0 | 323.4 | 332.5
Europe Building Products | Other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales |  | 0.0 | 0.0
Other Businesses |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | $ 0.0 | 0.6 | 14.6
Other Businesses | Fiber cement revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales |  | 0.0 | 0.0
Other Businesses | Fiber gypsum revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales |  | 0.0 | 0.0
Other Businesses | Other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales |  | $ 0.6 | $ 14.6

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_DisaggregationOfRevenueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
Name: | us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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: |