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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

X

- Definition

The amount of valuation allowance that potentially may be released if it is determined it is more likely than not the deferred tax assets will be realized.

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

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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.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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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.

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