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Acquisitions (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 29, 2016 | Feb. 28, 2014 | Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
Business Acquisition [Line Items] |  |  |  |  |
Cash consideration, net of cash acquired |  |  | $ 1.4 | $ 0.0 | $ 7.8
Modine Puxin Thermal System (Jiangsu) Co. Ltd. [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Ownership percentage by parent | 67.00% |  |  |  |
Cash consideration, net of cash acquired | $ 1.4 |  |  |  |
Additional cash consideration amount | 0.5 |  |  |  |
Purchase price allocation resulted in acquired equipment and other assets | 2.3 |  |  |  |
Purchase price allocation resulted in property, plant and equipment/acquired equipment and other long-lived assets | 1.5 |  |  |  |
Purchase price allocation, working capital net assets | $ 0.8 |  |  |  |
Jiangsu Puxin Heat Exchange System Co., Ltd [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Ownership percentage | 33.00% |  |  |  |
Barkell Limited of Consett, United Kingdom [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Percentage of interests acquired |  | 100.00% |  |  |
Cash consideration, net of cash acquired |  | $ 7.8 |  |  |
Purchase price allocation resulted in acquired intangible assets |  | 4.7 |  |  |
Purchase price allocation resulted in property, plant and equipment/acquired equipment and other long-lived assets |  | 2.0 |  |  |
Purchase price allocation, working capital net assets |  | $ 1.1 |  |  |
Intangible assets, amortization period |  | 10 years |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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