Stock-Based Compensation Restricted Stock (Details) (USD $)	3 Months Ended			3 Months Ended						3 Months Ended		9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Mar. 31, 2013 Restricted Stock	Mar. 31, 2013 Restricted Stock Units (RSUs)	Mar. 31, 2013 Cash Settled Restricted Stock Units Classified as Liabilities	Mar. 31, 2013 LTIP	Mar. 31, 2012 LTIP	Dec. 31, 2012 LTIP	Mar. 31, 2013 LTIP Minimum	Mar. 31, 2013 LTIP Maximum	Sep. 30, 2012 Board of Directors Restricted Stock Units (RSUs)	Sep. 30, 2011 Board of Directors Restricted Stock Units (RSUs)	Dec. 31, 2012 Board of Directors Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Restricted stock, beginning of period				346,563	33,242	37,184
Restricted stock, granted				84,113	14,379
Restricted stock, cash settled				0	37,184	37,184
Restricted stock, released				(89,009)	(39,000)
Restricted stock, forfeited				(11,602)	0
Restricted stock, end of period				330,065	45,805	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Grant Date Fair Value, Beginning balance				$ 44.74	$ 41.19	$ 66.13
Weighted Average Grant Date Fair Value, Granted				$ 72.18	$ 72.04
Weighted Average Grant Date Fair Value, Cash Settled				$ 0.00	$ 72.28	$ 72.28
Weighted Average Grant Date Fair Value, Released				$ 29.23	$ 54.66
Weighted Average Grant Date Fair Value, Forfeited				$ 47.27	$ 0.00
Weighted Average Grant Date Fair Value, Ending balance				$ 55.77	$ 64.57	$ 0.00
Award vesting period							3 years
Multiplier for target award based on total shareholder return on common stock										0.00%	200.00%
Share-based compensation expense	$ 3,700,000	$ 4,500,000					$ 200,000	$ 400,000				$ 300,000	$ 300,000
Accrued employee compensation and benefits	$ 10,954,000		$ 22,435,000				$ 2,500,000		$ 4,500,000					$ 2,400,000