Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $)	Sep. 30, 2011	Oct. 01, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	$ 1,300,000	$ 36,400,000
Corporate debt security	19,200,000
Option to purchase a company	1,400,000
Cash and cash equivalents	200,000	35,300,000
Short-term investment	19,205,000	0
Other assets	2,500,000	1,100,000
Total assets measured at fair value	21,900,000	36,400,000
Contingent consideration	(100,000)
Derivative liabilities	0	(500,000)
Accrued liabilities	0	(500,000)
Other long-term liabilities	(100,000)
Total liabilities measured at fair value	(100,000)	(500,000)
Quoted Prices In Active Markets For Identical Instruments (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	1,300,000	36,400,000
Corporate debt security	0
Option to purchase a company	0
Cash and cash equivalents	200,000	35,300,000
Short-term investment	0
Other assets	1,100,000	1,100,000
Total assets measured at fair value	1,300,000	36,400,000
Contingent consideration	0
Derivative liabilities	0	0
Accrued liabilities	0	0
Other long-term liabilities	0
Total liabilities measured at fair value	0	0
Significant Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	0	0
Corporate debt security	0
Option to purchase a company	0
Cash and cash equivalents	0	0
Short-term investment	0
Other assets	0	0
Total assets measured at fair value	0	0
Contingent consideration	0
Derivative liabilities	0	(500,000)
Accrued liabilities	0	(500,000)
Other long-term liabilities	0
Total liabilities measured at fair value	0	(500,000)
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	0	0
Corporate debt security	19,200,000
Option to purchase a company	1,400,000
Cash and cash equivalents	0	0
Short-term investment	19,200,000
Other assets	1,400,000	0
Total assets measured at fair value	20,600,000	0
Contingent consideration	(100,000)
Derivative liabilities	0	0
Accrued liabilities	0	0
Other long-term liabilities	(100,000)
Total liabilities measured at fair value	$ (100,000)	$ 0