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Compensation Plans (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 23, 2012	Jun. 25, 2011	Jun. 23, 2012	Jun. 25, 2011
Deferred Compensation Plan
Compensation expense	$ 0.1	$ 0.1	$ 0.2	$ 0.2
Stock Option Plans
Compensation Plans
Average expected life (in years for stock option plans, in months for employee stock purchase plan)			6	6
Average volatility (as a percent)			68.00%	52.00%
Risk-free interest rate (as a percent)			1.37%	2.40%
Weighted average fair value (in dollars per share)			$ 32.02	$ 28.93
Employee Stock Purchase Plan
Compensation Plans
Average expected life (in years for stock option plans, in months for employee stock purchase plan)			6	6
Average volatility (as a percent)			61.00%	52.00%
Risk-free interest rate (as a percent)			0.09%	0.20%
Weighted average fair value (in dollars per share)			$ 10.46	$ 14.05
Reduction of income before income taxes by stock compensation expenses	$ 4.4	$ 3.0	$ 13.6	$ 7.5

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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- Definition

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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