Stockholders' Equity and Stock-Based Compensation (Summary Of Stock Options Issued To Officers, Directors, And Employees Under 2000 Stock Incentive Plan And 2005 Stock Plan) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 28, 2012		Sep. 28, 2012
Share-based Compensation [Abstract]
Shares, Stock Options outstanding at September 28, 2012			4,622
Shares, Grants			2,228	[1]
Shares, Exercises			(87)
Shares, Forfeitures and cancellations			(123)
Shares, Stock options outstanding at December 28, 2012	6,640
Shares, Stock options vested December 28, 2012 and expected to vest	6,369
Shares, Stock options exercisable at December 28, 2012	2,428
Weighted Average Exercise Price, Stock options outstanding at September 28, 2012			$ 32.50
Weighted Average Exercise Price, Grants	$ 30.14	[1]
Weighted Average Exercise Price, Exercises	$ 14.87
Weighted Average Exercise Price, Forfeitures and cancellations	$ 44.89
Weighted Average Exercise Price, Stock options outstanding at December 28, 2012	$ 29.54
Weighted Average Exercise Price, Stock options vested December 28, 2012 and expected to vest	$ 29.48
Weighted Average Exercise Price, Stock options exercisable at December 28, 2012	$ 27.70
Weighted Average Remaining Contractual Life, Stock options outstanding at December 28, 2012	8,000
Weighted Average Remaining Contractual Life, Stock options vested December 28, 2012 and expected to vest			8,000
Weighted Average Remaining Contractual Life, Stock options exercisable at December 28, 2012			5,700
Aggregate Intrinsic Value, Stock options excercises	$ 1,605
Aggregate Intrinsic Value, Stock options outstanding at December 28, 2012	9,650
Aggregate Intrinsic Value, Stock options vested December 28, 2012 and expected to vest	9,564
Aggregate Intrinsic Value, Stock options exercisable at December 28, 2012	$ 8,270

[1] Includes the additional options granted in connection with the equity award modification.