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Business Combinations - Additional Information (Details) € in Millions, $ in Millions |  | 1 Months Ended | 12 Months Ended
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Apr. 03, 2018 USD ($) country | Apr. 03, 2018 EUR (€) country | Apr. 30, 2018 USD ($) | Apr. 30, 2018 EUR (€) | Mar. 31, 2019 USD ($) | Mar. 31, 2019 EUR (€) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  | $ 558.7 |  | $ 0.0 | $ 0.0
Fermacell |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Consideration transferred |  |  | $ 635.6 | € 516.4 |  |  |  |
Voting interest acquired (as percent) | 100.00% | 100.00% |  |  |  |  |  |
Cash consideration | $ 492.4 | € 400.0 |  |  |  |  |  |
Number of countries | country | 13 | 13 |  |  |  |  |  |
Transaction and integration related costs |  |  |  |  | 21.8 |  |  |
Net adjustments related to property, plant and equipment and deferred tax valuations | € |  |  |  |  |  | € 0.5 |  |
Inventory fair value adjustment |  |  |  |  | $ 7.3 |  |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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