Awards Granted, Weighted-Average Exercise Price, Weighted-Average Fair Value and Weighted-Average Assumptions Used in the Calculation of Compensation Expense (Detail) (USD $)	6 Months Ended
Apr. 01, 2012 Restricted shares	Apr. 01, 2012 Performance stock units	Apr. 03, 2011 Restricted Stock Awards and Units	Apr. 03, 2011 Stock options and share appreciation rights Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards	1,522,361	350,000	1,720,893	3,024,480
Exercise price per award				$ 13.92
Fair value per award	$ 19.30	$ 17.77	$ 20.95	$ 7.12
Risk Free Rate				0.20%
Expected Dividend Yield				0.00%
Expected Life (Years)				1.1
Expected Volatility				41.90%

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.

+ References+ Details

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.

+ References+ Details

- Definition

The number of shares newly issued during the reporting period under the plan.

+ References+ Details