Derivative Instruments And Hedging Activities (Fair Value Of Derivatives Designated As Hedging Instruments) (Details) (Interest Rate Swap [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012 Prepaid expenses and other current assets [Member]	Mar. 31, 2012 Other Non Current Assets Member
Derivatives, Fair Value [Line Items]
Fair value of interest rate fair value hedges	$ 3,725	$ 6,734

Fair value as of the balance sheet date of all derivative assets designated as interest rate fair value hedging instruments.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 17

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

Name:	us-gaap_InterestRateFairValueHedgeAssetAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant