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Significant Accounting Policies, Significant Accounting Policies, Airedale facility fire, Tooling Costs and Research and Development (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |
Gain within other income related to insurance settlement | [1] | $ 0.0 | $ 0.0 | $ 9.5
Research and development [Abstract] |  |  |  |
Research and development cost |  | $ 65.8 | 64.4 | 61.1
Loss by Fire [Member] |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |
Gain within other income related to insurance settlement |  |  |  | $ 9.5
Tools [Member] |  |  |  |
Tooling [Abstract] |  |  |  |
Property, plant and equipment, depreciable lives |  | 3 years |  |
Company-owned tooling, net |  | $ 22.4 | 20.8 |
Customer owned tooling receivable |  | $ 10.7 | $ 7.8 |
[1] | During fiscal 2016, the Company settled an insurance claim related to machinery and equipment destroyed in a fire at its Airedale facility and recorded a gain of $9.5 million. See Note 1 for additional information.

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- Definition Amount, net of accumulated depreciation, depletion and amortization, of company owned tooling as of the balance sheet date. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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