Significant Accounting Policies - Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Apr. 28, 2012	Apr. 27, 2013 Buildings and improvements Maximum	Apr. 27, 2013 Buildings and improvements Minimum	Apr. 27, 2013 Machinery and equipment Maximum	Apr. 27, 2013 Machinery and equipment Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives of property, plant and equipment		40 years	5 years	15 years	3 years
Fully depreciated gross property, plant and equipment write-off	$ 39,082

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration