Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

No definition available.

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

Stock Option and bonus plans (Details Narrative 1) (USD $)	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Stock Option And Bonus Plans Details Narrative 1
Intrinsic value of options outstanding and exercisable