Restructuring and Other Charges (Narrative) (Details) (USD $)	12 Months Ended
	Sep. 28, 2012	Sep. 30, 2011	Oct. 01, 2010
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 7,752,000	$ 2,363,000	$ (1,040,000)
Payments for Restructuring	8,054,000	2,852,000	1,541,000
2011 restructuring and other charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	700,000	2,400,000
Payments for Restructuring	1,200,000
AATI [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	6,400,000
Workforce Reductions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	7,199,000	2,363,000
Payments for Restructuring	7,254,000	2,189,000	236,000
Workforce Reductions [Member] | AATI [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	5,800,000
Facility Closings [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	553,000	0
Payments for Restructuring	228,000	193,000	648,000
Facility Closings [Member] | AATI [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 500,000