Stock-Based Compensation (Fair Value of Stock Compensation) (Details) (USD $)	3 Months Ended
Dec. 31, 2011 years	Jan. 01, 2011 years
Employee Stock Purchase Plans
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected life in years	0.5	0.5
Risk-free interest rate	0.10%	0.20%
Expected volatility	49.30%	30.60%
Expected dividends	$ 0	$ 0
Weighted average fair value per share	$ 14.93	$ 9.78
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards and units vesting period (in years)	3 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards and units vesting period (in years)	3 years
Performance RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate	0.39%
Expected volatility	41.80%
Weighted average fair value of performance stock units	$ 71.59
Performance RSUs \| Annual vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards and units vesting period (in years)	3 years
Performance RSUs \| Single vest measurement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards and units vesting period (in years)	3 years

The intrinsic value of equity-based payment equity instruments, excluding stock or unit options, granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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