Restructuring changes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 30, 2011	Dec. 31, 2010
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 720	$ 0
Payments for Restructuring	(923)
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	2,028
Charges to costs and expenses	720	0
Cash payments	(923)
Restructuring Reserve, Ending Balance	1,825
Facility Closings [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0
Payments for Restructuring	(48)
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	819
Charges to costs and expenses	0
Cash payments	(48)
Restructuring Reserve, Ending Balance	771
License and Software Write-offs and Other [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0
Payments for Restructuring	(123)
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	707
Charges to costs and expenses	0
Cash payments	(123)
Restructuring Reserve, Ending Balance	584
Workforce Reductions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	720
Payments for Restructuring	(752)
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	502
Charges to costs and expenses	720
Cash payments	(752)
Restructuring Reserve, Ending Balance	$ 470