Patent Agreement, Net (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	12 Months Ended
Aug. 31, 2010	Aug. 26, 2009	Mar. 26, 2011	Mar. 27, 2010
Patent Agreement, Net [Abstract]
Cash consideration received recorded as recovery of costs previously incurred	$ 4,000	$ 1,400	$ 4,000	$ 1,400

Gain (loss) recognized on the sale of oil and gas property or timber property.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Name:	us-gaap_GainLossOnSaleOfProperty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration