Compensation Plans (Tables)

9 Months Ended

Jun. 23, 2012

Compensation Plans

Schedule of assumptions used in estimating the grant-date fair value of employee stock options and similar instruments

	Thirty-nine weeks ended
	June 23, 2012			June 25, 2011
Average expected life	6 years			6 years
Average volatility	68		%	52		%
Dividend yield	—			—
Risk-free interest rate	1.37		%	2.40		%
Weighted average fair value	$	32.02		$	28.93

Schedule of assumptions used in estimating the grant-date fair value of employees' purchase rights under Employee Stock Purchase Plan

	Thirty-nine weeks ended
	June 23, 2012			June 25, 2011
Average expected life	6 months			6 months
Average volatility	61		%	52		%
Dividend yield	—			—
Risk-free interest rate	0.09		%	0.20		%
Weighted average fair value	$	10.46		$	14.05