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Income Taxes - Tax Credit Carryforward Narrative (Details) $ in Millions	Apr. 28, 2018 USD ($)
Internal Revenue Service (IRS) [Member]
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	$ 2.1
Federal income tax benefit	0.4
State
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	78.2
Federal income tax benefit	5.2
Foreign tax authority
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	0.3
Federal income tax benefit	$ 0.1
Foreign tax authority | Investment Tax Credit Carryforward | Malta
Tax Credit Carryforward [Line Items]
Percentage of qualified expenditures subject to investment tax credit	30.00%
Total unused credits	$ 29.3
Tax Credit Carryforward, Period, 2020 Expiration | Foreign tax authority | Investment Tax Credit Carryforward | Malta
Tax Credit Carryforward [Line Items]
Total unused credits	1.7
Tax Credit Carryforward, Period, Indefinite | Foreign tax authority | Investment Tax Credit Carryforward | Malta
Tax Credit Carryforward [Line Items]
Total unused credits	$ 27.6

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Investment Tax Credit, Foreign, Percentage of Qualified Expenditures

+ References

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- Definition

Operating Loss Carryforwards, Potential Tax Benefit

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- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319

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