Share-based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified		3 Months Ended			99 Months Ended		3 Months Ended			128 Months Ended	3 Months Ended
	Sep. 30, 2013 item	Sep. 30, 2013 Maximum	Sep. 30, 2013 Restricted stock	Sep. 30, 2013 2006 LTIP	Sep. 30, 2013 2006 LTIP	Sep. 30, 2013 2006 LTIP Restricted stock	Sep. 30, 2013 2011 LTIP	Sep. 30, 2013 2011 LTIP Restricted stock	Sep. 30, 2013 2003 Plan	Sep. 30, 2013 2003 Plan	Sep. 30, 2013 Old Plan
Stock-based Compensation
Number of share-based employee compensation plans	4
Options outstanding (in shares)	3,000,000
Options issued (in shares)				1,200,000			1,200,000		561,000
Shares authorized				2,500,000	2,500,000		1,500,000		1,100,000	1,100,000
Options exercised (in shares)					588,000					257,000
Shares already vested under a plan since its inception			40,000			708,000		43,000
Shares for future issuances				21,000	21,000		247,000
Other disclosures
Share-based compensation awards vesting period		3 years
Share-based compensation awards maximum contractual term		10 years
Total unrecognized compensation cost related to non-vested share-based compensation awards granted under the Plans			$ 6.4
Weighted average period during which the cost is expected to be recognized			2 years 8 months 12 days
Number of further shares authorized to be issued											0