Consolidated Statements of Comprehensive (Loss) Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income (loss) attributable to Magellan Petroleum Corporation	$ 15,509	$ (19,767)
Foreign currency translation gain (loss)	488	(569)
Reclassification of foreign currency translation gain to earnings upon sale of foreign subsidiary	(5,767)	0
Unrealized holding losses on securities available-for-sale	(7,256)	(112)
Other comprehensive loss, net of tax	(12,535)	(681)
Comprehensive income (loss) attributable to Magellan Petroleum Corporation	$ 2,974	$ (20,448)