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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

-URI http://asc.fasb.org/extlink&oid=6527854

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15A

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

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Income Taxes (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 24, 2015	Apr. 25, 2014	Apr. 26, 2013	Apr. 27, 2012
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 4,939	$ 5,652	$ 6,885
Unrecognized Tax Benefits	5,202us-gaap_UnrecognizedTaxBenefits	5,952us-gaap_UnrecognizedTaxBenefits	9,554us-gaap_UnrecognizedTaxBenefits	11,045us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	(166)	204	394
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	839	1,005
State and Local Jurisdiction \| Minimum
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	447
State and Local Jurisdiction \| Maximum
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	$ 2,041