Acquisitions, investments and dispositions (Details Textual) (USD $) In Millions, unless otherwise specified	Feb. 28, 2014
Acquisitions Investments and Dispositions [Abstract]
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds	$ 185.8
Cash proceeds from sale of a business	$ 28.5

The value of all consideration given or received by the Entity in the significant acquisition or disposal.

No definition available.

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