Restructuring and Other Charges (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 30, 2012	Apr. 01, 2011	Mar. 30, 2012	Apr. 01, 2011
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 5,895,000	$ 0	$ 6,615,000	$ 0
Payments for Restructuring	(3,400,000)		(4,332,000)
Restructuring and Related Cost, Expected Cost	6,300,000
Restructuring Reserve [Roll Forward]
Restructuring Reserve			2,028,000
Restructuring Charges	5,895,000	0	6,615,000	0
Payments for Restructuring	(3,400,000)		(4,332,000)
Restructuring Reserve, Accrual Adjustment			4,000
Restructuring Reserve	4,315,000		4,315,000
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			440,000
Payments for Restructuring			(97,000)
Restructuring Reserve [Roll Forward]
Restructuring Reserve			819,000
Restructuring Charges			440,000
Payments for Restructuring			(97,000)
Restructuring Reserve, Accrual Adjustment			0
Restructuring Reserve	1,162,000		1,162,000
license and software write-downs and other [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			0
Payments for Restructuring			(212,000)
Restructuring Reserve [Roll Forward]
Restructuring Reserve			707,000
Restructuring Charges			0
Payments for Restructuring			(212,000)
Restructuring Reserve, Accrual Adjustment			4,000
Restructuring Reserve	499,000		499,000
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			6,175,000
Payments for Restructuring			(4,023,000)
Restructuring Reserve [Roll Forward]
Restructuring Reserve			502,000
Restructuring Charges			6,175,000
Payments for Restructuring			(4,023,000)
Restructuring Reserve, Accrual Adjustment			0
Restructuring Reserve	2,654,000		2,654,000
AATI Restucturing [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	440,000
Restructuring Reserve [Roll Forward]
Restructuring Charges	440,000
AATI Restucturing [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	5,500,000
Restructuring Reserve [Roll Forward]
Restructuring Charges	5,500,000
SiGe Restructure [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			700,000
Restructuring Reserve [Roll Forward]
Restructuring Charges			$ 700,000