Fair Value Measurement Of Assets And Liabilities (Narrative) (Details) (USD $)	3 Months Ended	6 Months Ended
Sep. 30, 2011	Oct. 01, 2010	Mar. 31, 2011
Fair Value Measurement Of Assets And Liabilities [Abstract]
Fair value adjustments	$ 0	$ 0
Transfers between levels in fair value hierarchy	0	0
Assets held-for-sale, current	$ 26,100,000		$ 27,100,000

Current assets (normally turning over within one year or one business cycle if longer) that are held for sale apart from normal operations and anticipated to be sold within one year.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 46

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 205

-SubTopic 20

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759

Name:	us-gaap_AssetsHeldForSaleCurrent
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant