Indebtedness (Trade Receivables Securitization Narrative) (Details) (Trade Receivables Securitization [Member], USD $) In Millions, unless otherwise specified	9 Months Ended
Dec. 31, 2011 entities
Trade Receivables Securitization [Member]
Debt Instrument [Line Items]
Number of commercial banks participating in trade securitization agreement	3
Trade receivables securitization agreement, maximum amount	$ 295
Basis points	0.70%
Trade receivables securitization expiration date	December 2013
Amount of outstanding borrowing under Securitization Agreement	$ 295

The percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant