Borrowing Arrangements (Narrative) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended					9 Months Ended
	Jul. 01, 2011	Jul. 02, 2010	Jul. 01, 2011	Jul. 02, 2010	Oct. 01, 2010	Mar. 02, 2007	Mar. 02, 2007 Convertible Subordinated Notes 1.25% Due March 2010 [Member]	Jul. 01, 2011 Convertible Subordinated Notes 1.50% Due March 2012 [Member]	Oct. 01, 2010 Convertible Subordinated Notes 1.50% Due March 2012 [Member]	Oct. 02, 2009 Convertible Subordinated Notes 1.50% Due March 2012 [Member]	Mar. 02, 2007 Convertible Subordinated Notes 1.50% Due March 2012 [Member]
Principal amount of convertible subordinated notes issued						$ 200,000,000	$ 100,000,000			$ 100,000,000	$ 100,000,000
Debt instrument actual if converted value								65,700,000
Non convertible borrowing rate for estimating fair value	6.86%	6.86%	6.86%	6.86%
Percentage of convertible subordinated notes	1.50%		1.50%				1.25%	1.50%			1.50%
Conversion price of the 1.50% Notes per $1000 of principal amount								105.0696
Conversion price	$ 9.52		$ 9.52					$ 9.52
Principal amount of the convertible notes	26,677,000		26,677,000		26,677,000					77,300,000
Fair value of equity component	6,061,000		6,061,000		6,061,000					22,700,000
Stock price to calculate if converted value								$ 23.44
Amortized Period, in months								8
If-converted value of the remaining Notes exceeds the related principal amount by								39,000,000
Number of shares underlying the remaining 1.50% Notes									2.8
Long-term debt consists of convertible notes					24,743,000
Termination of credit facility			50,000,000
Short-term debt	$ 25,744,000		$ 25,744,000		$ 50,000,000			$ 25,700,000