Stockholders' Equity (Narrative) (Details) (USD $)	3 Months Ended		124 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 07, 2012	Jun. 30, 2012	Aug. 24, 2011	May 27, 2009	Jun. 06, 2002	Apr. 30, 1997
Stockholders' Equity [Line Items]
Shares authorized to be repurchased under repurchase program						20,000,000	10,000,000	6,600,000
Common shares repurchased	200,000		27,900,000
Cost of common shares repurchased	$ 8,100,000		$ 903,900,000
Additional shares that can be repurchased under the approved share repurchase program	8,600,000		8,600,000
Preferred stock, shares authorized	2,000,000		2,000,000		2,000,000				2,000,000
Preferred stock at par value	$ 0.01		$ 0.01		$ 0.01				$ 0.01
Stock option and restricted stock units expiration period	7 years
Reduction in the number of shares of common stock available for issuance	2		2
Common stock authorized for issuance	35,500,000		35,500,000
Number of securities remaining available for future issuance	14,600,000		14,600,000
Maximum number of shares subject to awards granted	3,000,000		3,000,000
Number of common stock shares granted in participant's initial year of hiring	4,500,000		4,500,000
Unrecognized compensation costs related to unvested stock-based compensation arrangements	55,300,000		55,300,000
Expected weighted average period of unrecognized compensation costs related to unvested stock-based compensation arrangements	2 years 7 months 6 days
Aggregate intrinsic value of the stock-based compensation arrangements outstanding	243,800,000		243,800,000
Aggregate intrinsic value of the stock-based compensation arrangements exercisable	115,800,000		115,800,000
Aggregate intrinsic value of the options exercised	21,700,000	5,600,000
Cash dividend declared per share	$ 0.17
CDI to NYSE shares ratio				10
Dividend paid	22,843,000
Employee Stock Purchase Plan [Member]
Stockholders' Equity [Line Items]
Number of securities remaining available for future issuance	400,000		400,000
Percentage of purchase price of common stock lower than the fair market value of common stock on the date of grant	85.00%
Percentage of purchase price of common stock lower than the fair market value of common stock on the date of purchase	85.00%
Stock-based compensation expense	800,000	500,000
Minimum [Member]
Stockholders' Equity [Line Items]
Stock options and restricted stock units vesting period	1 year
Minimum [Member] | Employee Stock Purchase Plan [Member]
Stockholders' Equity [Line Items]
Employee stock purchase program offering period	3 months
Maximum [Member]
Stockholders' Equity [Line Items]
Stock options and restricted stock units vesting period	4 years
Maximum [Member] | Employee Stock Purchase Plan [Member]
Stockholders' Equity [Line Items]
Employee stock purchase program offering period	27 months
Common stock shares subscribed	$ 25,000		$ 25,000