Earnings Per Share (Narrative) (Details) (USD $)	9 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Mar. 31, 2012	Mar. 31, 2012 Restricted Stock [Member]	Mar. 31, 2011 Restricted Stock [Member]	Mar. 31, 2012 Restricted Stock [Member]	Mar. 31, 2011 Restricted Stock [Member]	Mar. 31, 2012 Stock Options [Member]	Mar. 31, 2011 Stock Options [Member]	Mar. 31, 2012 Stock Options [Member]	Mar. 31, 2011 Stock Options [Member]	Mar. 31, 2012 Convertible Senior Notes [Member]	Jun. 30, 2011 Convertible Senior Notes [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Common stock outstanding and not included in the computation of diluted earnings per share		0	7,530	5,000	15,829	981,637	995,599	1,943,917	1,703,014
Initial conversion price of the Convertible Senior Notes	$ 104
Amount of Convertible Senior Notes	$ 1,000
Convertible Senior Notes, interest rate										1.25%
Convertible Senior Notes outstanding										$ 400,000,000	$ 400,000,000
Debt instrument, maturity date										Oct. 15, 2012