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Significant Accounting Policies - Goodwill and Intangibles (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Apr. 27, 2013 reporting_unit	Apr. 27, 2013 reporting_unit	Apr. 28, 2012	Apr. 30, 2011
Goodwill [Line Items]
Number of reporting units with goodwill	4	4
Number of reporting units where fair value exceeded carrying value	3	3
Number of reporting units where fair value was less than carrying value	1	1
Goodwill impairment charge	$ 4,326	$ 4,326	$ 0	$ 0
Minimum
Goodwill [Line Items]
Percentage by which fair value exceeded carrying value	16.00%	16.00%
Maximum
Goodwill [Line Items]
Percentage by which fair value exceeded carrying value	75.00%	75.00%

X

- Definition

Goodwill Impairment Test, Access of Fair Value over Carrying Value, Percentage

+ References

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- Definition

Number of Reporting Units with Goodwill

+ References

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- Definition

Number of Reporting Units with Goodwill, Carrying Value Exceeds Fair Value

+ References

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- Definition

Number of Reporting Units with Goodwill, Fair Value Exceeds Carrying Value

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- Definition

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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-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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-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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