Earnings Per Share Earnings Per Share (Details) (USD $)	3 Months Ended												12 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009	Sep. 30, 2009	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Earnings Per Share [Abstract]
Net (loss) income	$ (1,188,706,000)	$ (417,116,000)	$ 63,127,000	$ 26,954,000	$ 34,799,000	$ 72,983,000	$ 85,278,000	$ 36,448,000	$ 47,900,000	$ 84,570,000	$ 20,274,000	$ 15,762,000	$ (1,515,741,000)	$ 229,508,000	$ 168,506,000
Basic													126,659,000	137,376,000	136,917,000
Effect of stock-based awards													0	940,000	750,000
Diluted													126,659,000	138,316,000	137,667,000
Basic													$ (11.97)	$ 1.67	$ 1.23
Diluted	$ (9.51)	$ (3.31)	$ 0.49	$ 0.21	$ 0.26	$ 0.53	$ 0.61	$ 0.25	$ 0.33	$ 0.59	$ 0.14	$ 0.13	$ (11.97)	$ 1.66	$ 1.22
Time based options excluded from diluted EPS computation													9,200,000	300,000	1,600,000
Contingently Issuable Securities Excluded from Computation of Earnings Per Share, Amount													$ 3,100,000