Subsequent Event (Narrative) (Details) (GrainCorp Limited [Member], AUD) In Billions, except Per Share data, unless otherwise specified	0 Months Ended
	May 01, 2013	Mar. 31, 2013
GrainCorp Limited [Member]
Equity interest in an entity (as a percent)		19.80%
Potential cash offer to acquire an entity, per share	12.20
Aggregate transaction value related to the potential acquisition of an entity	3.4
Dividends to be paid by acquiree to existing shareholders as part of the acquisition agreement	1.00