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Employee Stock Purchase Plan (Details 1) (USD $)	6 Months Ended
Employee Stock Purchase Plan (Details 1) (USD $)	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010	Dec. 31, 2009	Jun. 30, 2009
Per share fair value of employees' purchase rights in each of the six month offering periods
Granted at target level, weighted average grant date fair value	$ 19.65	$ 12.34	$ 9.20	$ 7.69	$ 7.71	$ 8.36

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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