Income Taxes (Narrative) (Details) (USD $)	3 Months Ended			6 Months Ended		3 Months Ended
	Mar. 30, 2013	Sep. 30, 2012	Mar. 31, 2012	Mar. 30, 2013	Mar. 31, 2012	Dec. 29, 2012 Servigistics, Inc	Oct. 02, 2012 Servigistics, Inc
Income Tax Disclosure [Line Items]
Effective income tax rate	12.00%		9.00%	(68.00%)	24.00%
Income before income taxes	$ 19,400,000		$ 3,900,000	$ 31,400,000	$ 33,800,000
Statutory Federal income tax rate				35.00%
Income Tax Reconciliation, Change in Enacted Tax Rate					1,500,000
Income Tax Reconciliation, Tax Credits, Research	2,700,000
Income Tax Reconciliation, Tax Settlements, Foreign	3,200,000
Non-cash charge to establish a valuation allowance against U.S. deferred tax assets		124,500,000
U.S. deferred tax liabilities		28,000,000
Identifiable intangible assets						118,300,000	118,300,000
Deferred tax assets and liabilities, net						(35,600,000)	35,566,000
Tax benefit recorded to decrease valuation allowance in conjunction with business combination						32,600,000
Unrecognized tax benefits	18,100,000	19,100,000		18,100,000
Income tax provision upon recognition of unrecognized tax benefit	17,300,000			17,300,000
Increase in valuation allowance	7,400,000			7,400,000
Potentail reduction in unrecognized tax benefits and accrued interest over next 12 months	$ 5,000,000			$ 5,000,000