Compensation Plans (Tables)

9 Months Ended

Jun. 29, 2013

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 29, 2013			June 23, 2012
Average expected life	6 years			6 years
Average volatility	81		%	68		%
Dividend yield	—			—
Risk-free interest rate	1.02		%	1.37		%
Weighted average fair value	$	31.17		$	32.02

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 29, 2013			June 23, 2012
Average expected life	6 months			6 months
Average volatility	86		%	61		%
Dividend yield	—			—
Risk-free interest rate	0.13		%	0.09		%
Weighted average fair value	$	14.38		$	10.46