Restructuring changes (Details) (USD $) In Thousands	12 Months Ended
	Sep. 30, 2011	Oct. 01, 2010	Oct. 02, 2009
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	$ 2,189	$ 3,279
Charges to costs and expenses	2,363	(1,040)	15,982
Other	328	451	(198)
Non-cash items			(6,571)
Cash payments	(2,852)	(1,541)	(5,934)
Restructuring Reserve, Ending Balance	2,028	2,189	3,279
Facility Closings [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	1,012	1,210
Charges to costs and expenses	0		1,967
Other	0	450	9
Non-cash items			0
Cash payments	(193)	(648)	(766)
Restructuring Reserve, Ending Balance	819	1,012	1,210
License and Software Write-offs and Other [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	1,177	1,586
Charges to costs and expenses	0		3,892
Other	0	248	(368)
Non-cash items			(955)
Cash payments	(470)	(657)	(983)
Restructuring Reserve, Ending Balance	707	1,177	1,586
Workforce Reductions [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	0	483
Charges to costs and expenses	2,363		4,507
Other	328	(247)	161
Non-cash items			0
Cash payments	(2,189)	(236)	(4,185)
Restructuring Reserve, Ending Balance	502	0	483
Asset Impairments [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	0	0
Charges to costs and expenses	0		5,616
Other	0	0	0
Non-cash items			(5,616)
Cash payments	0	0	0
Restructuring Reserve, Ending Balance	$ 0	$ 0	$ 0