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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Income Taxes [Abstract] |  |  |  |
Effective income tax rate | (3.20%) | 20.00% | 6.10% | 29.00%
Valuation Allowance [Line Items] |  |  |  |
Tax benefit from foreign development tax credit | $ 2.2 |  | $ 5.7 |
Unrecognized tax benefits reductions in fiscal 2018 | 1.8 |  |  |
Foreign Tax Jurisdiction [Member] |  |  |  |
Valuation Allowance [Line Items] |  |  |  |
Deferred tax asset, valuation allowance | 47.0 |  | 47.0 |
Possible future release of valuation allowance against certain tax assets | 3.0 |  | 3.0 |
Domestic Tax Jurisdiction [Member] |  |  |  |
Valuation Allowance [Line Items] |  |  |  |
Deferred tax asset, valuation allowance | $ 5.8 |  | $ 5.8 |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign tax credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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