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Income Taxes - Tax Credit Carryforwards (Details) (USD $) In Thousands, unless otherwise specified			12 Months Ended
	Apr. 27, 2013	Apr. 28, 2012	Apr. 27, 2013 Federal	Apr. 27, 2013 Investment tax credit
Tax Credit Carryforward [Line Items]
Foreign tax credit carryforward	$ 7,661	$ 1,393	$ 7,661
Tax credit carryforward expiration period			10 years
Percentage of qualified expenditures subject to investment tax credit				30.00%
Amount of unused credits				21,469
Valuation allowance				$ 7,226

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- Definition

Investment Tax Credit, Foreign, Percentage of Qualified Expenditures

+ References

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- Definition

Tax Credit Carryforward Expiration Period

+ References

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319



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- Definition

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 Statement of Financial Accounting Standard (FAS)

-Number 109

-Paragraph 17

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Carryforwards

-URI http://asc.fasb.org/extlink&oid=6506874



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- Definition

The portion of the deferred tax asset arising from a tax credit carryforward for which it is more likely than not that a tax benefit will not be realized.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 109

-Paragraph 48

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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