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Note 11 Fair Value Assumptions and Methodology (Details) (Employee stock options)	3 Months Ended		6 Months Ended
	Mar. 30, 2013	Mar. 31, 2012	Mar. 30, 2013	Mar. 31, 2012
Employee stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	84.70%	85.80%	85.40%	85.60%
Risk-free interest rate	0.80%	0.90%	0.70%	0.90%
Dividend yield	0.00%	0.00%	0.00%	0.00%
Expected life of options (years)	5 years 0 months 0 days	5 years 0 months 0 days	5 years 0 months 0 days	5 years 0 months 0 days

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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