Changes in Operations (Details1)	6 Months Ended		3 Months Ended		1 Months Ended		3 Months Ended
	Jun. 30, 2012 USD ($)	Jun. 30, 2011 USD ($)	Sep. 30, 2012 Cook [Member] USD ($)	Sep. 30, 2012 Cook [Member] AUD	Jun. 30, 2012 Alice Springs Intermodal And Freight Terminal [Member] USD ($)	Jun. 30, 2012 Alice Springs Intermodal And Freight Terminal [Member] AUD	Sep. 30, 2012 Alice Springs Intermodal And Freight Terminal [Member] USD ($)
Purchase of property and equipment	$ 106,538,000	$ 62,065,000			$ 9,200,000	9,000,000
Stamp duty					500,000	500,000
Expected proceeds from sale of property, Plant, and equipment	8,141,000	3,106,000	4,100,000	4,000,000
Expected gain on sale of assets, net of tax			$ 1,300,000	1,300,000
Expected EPS impact from gain on sale of property and equpment							$ 0.03